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<article article-type="research-article" dtd-version="1.3" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">rentrad</journal-id><journal-title-group><journal-title xml:lang="ru">Вестник рентгенологии и радиологии</journal-title><trans-title-group xml:lang="en"><trans-title>Journal of radiology and nuclear medicine</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">0042-4676</issn><issn pub-type="epub">2619-0478</issn><publisher><publisher-name>Limited Liability Company "LUCHEVAYA DIAGNOSTIKA", Russian Association of Radiologists</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.20862/0042-4676-2021-102-1-28-41</article-id><article-id custom-type="elpub" pub-id-type="custom">rentrad-610</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>ОРИГИНАЛЬНЫЕ СТАТЬИ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>ORIGINAL RESEARCH</subject></subj-group></article-categories><title-group><article-title>МРТ-скрининг легких в условиях пандемии COVID-19 на этапах медицинской помощи как инструмент снижения суммарной коллективной дозы облучения населения</article-title><trans-title-group xml:lang="en"><trans-title>MRI Screening of Lungs in the COVID-19 Pandemic at the Stages of Medical Care as a Tool to Reduce the Total Collective Dose of Radiation to the Population</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-3355-5737</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Коробов</surname><given-names>А. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Korobov</surname><given-names>A. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Коробов Андрей Владимирович, к. м. н., директор</p><p>ул. Фридриха Энгельса, 58А, Воронеж, 394036</p></bio><bio xml:lang="en"><p>Andrey V. Korobov, Cand. Med. Sc., Director</p><p>ul. Fridrikha Engelsa, 58А, Voronezh, 394036</p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-5994-0468</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Нуднов</surname><given-names>Н. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Nudnov</surname><given-names>N. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Нуднов Николай Васильевич, д. м. н., профессор, зам. директора по научной работе</p><p>ул. Профсоюзная, 86, Москва, 117997</p></bio><bio xml:lang="en"><p>Nikolay V. Nudnov, Dr. Med. Sc., Professor, Deputy Director for Research</p><p>ul. Profsoyuznaya, 86, Moscow, 117997</p></bio><email xlink:type="simple">nudnov@rncrr.ru</email><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-7852-4862</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Попов</surname><given-names>А. Ю.</given-names></name><name name-style="western" xml:lang="en"><surname>Popov</surname><given-names>A. Yu.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Попов Алексей Юрьевич, к. м. н., руководитель научно-исследовательской лаборатории методов медицинской визуализации</p><p>ул. Фридриха Энгельса, 58А, Воронеж, 394036</p></bio><bio xml:lang="en"><p>Aleksey Yu. Popov, Cand. Med. Sc., Head of the Research Laboratory of Medical Imaging Methods</p><p>ul. Fridrikha Engelsa, 58А, Voronezh, 394036</p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-0960-6370</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Кульнева</surname><given-names>Т. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Kul’neva</surname><given-names>T. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Кульнева Таисия Владимировна, зам. директора по экспертной работе</p><p>ул. Фридриха Энгельса, 58А, Воронеж, 394036</p></bio><bio xml:lang="en"><p>Taisiya V. Kul’neva, Deputy Director for Expert Work</p><p>ul. Fridrikha Engelsa, 58А, Voronezh, 394036</p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-8229-8458</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Бабенко</surname><given-names>В. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Babenko</surname><given-names>V. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Бабенко Владислав Васильевич, руководитель консультативно-диагностического отделения</p><p>ул. Фридриха Энгельса, 58А, Воронеж, 394036</p></bio><bio xml:lang="en"><p>Vladislav V. Babenko, Head of the Consulting and Diagnostic Department</p><p>ul. Fridrikha Engelsa, 58А, Voronezh, 394036</p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-0531-7966</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Пронькина</surname><given-names>Е. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Pron’kina</surname><given-names>E. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Пронькина Елена Владимировна, врач-рентгенолог</p><p>пер. Сивцев Вражек, 26/28, Москва, 119002</p></bio><bio xml:lang="en"><p>Еlena V. Pron’kina, Radiologist</p><p>pereulok Sivtsev Vrazhek, 26/28, Moscow, 119002</p></bio><xref ref-type="aff" rid="aff-3"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>ЧУ ДПО «Институт повышения квалификации медицинских кадров»</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Institute of Advanced Training of Medical Personnel</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>ФГБУ «Российский научный центр рентгенорадиологии» Минздрава России</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Russian Scientific Center of Roentgenoradiology, Ministry of Health of the Russian Federation</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-3"><aff xml:lang="ru"><institution>ФГБУ «Поликлиника № 1» Управления делами Президента Российской Федерации</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Polyclinic No. 1, Office of the President of the Russian Federation</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2021</year></pub-date><pub-date pub-type="epub"><day>10</day><month>03</month><year>2021</year></pub-date><volume>102</volume><issue>1</issue><fpage>28</fpage><lpage>41</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Коробов А.В., Нуднов Н.В., Попов А.Ю., Кульнева Т.В., Бабенко В.В., Пронькина Е.В., 2021</copyright-statement><copyright-year>2021</copyright-year><copyright-holder xml:lang="ru">Коробов А.В., Нуднов Н.В., Попов А.Ю., Кульнева Т.В., Бабенко В.В., Пронькина Е.В.</copyright-holder><copyright-holder xml:lang="en">Korobov A.V., Nudnov N.V., Popov A.Y., Kul’neva T.V., Babenko V.V., Pron’kina E.V.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://www.russianradiology.ru/jour/article/view/610">https://www.russianradiology.ru/jour/article/view/610</self-uri><abstract><sec><title>Цель</title><p>Цель: оценить роль и место МРТ-скрининга легких в выявлении пневмонии и маршрутизации пациентов.</p></sec><sec><title>Материал и методы</title><p>Материал и методы. Было выполнено 500 МРТ-исследований в период с 01.11.2020 г. по 15.12.2020 г. на базе более 20 диагностических центров федеральной сети «МРТ-Эксперт». Выделено две группы: 1-я группа (контрольная) – 50 человек, у которых проводили сравнение МРТ- и КТ-исследований в единый временной промежуток 0–2 сут (среди них было 25 пациентов, имевших положительный ПЦР-тест на SARS-CoV-2 и 25 условно здоровых пациентов); 2-я группа (результативная) – 450 человек, которым выполняли МРТ средостения со скрининговым обследованием легких на аппаратах Philips 1.5T и Siemens 1.5T. На основе полученных результатов проведен статистический анализ базы медицинских данных.</p></sec><sec><title>Результаты</title><p>Результаты. В ходе исследования были определены обязательные и дополнительные программы МРТ-сканирования: для томографа Philips 1.5T обязательные программы – sSSH_FB: tra и cor, THRIVE: tra (вдох/выдох); для Siemens 1.5T – T2_BLADE: cor, trа, sag. При сопоставлении визуальных данных 25 больных контрольной группы с положительным ПЦР-тестом в единый временной промежуток 0–2 сут факт выявления МР-изменений совпадал с КТ-изменениями в 19 случаях (76%). Среди 475 пациентов, обследованных лишь одним методом (МРТ-скринингом легких), патологические изменения в легких были выявлены у 209 (44%). По локализации патологические изменения распределились следующим образом: двусторонние изменения – 147 (70,3%), правосторонние изменения – 41 (19,6%), левосторонние изменения – 21 (10%); нижние отделы – 56 (26,8%), средние отделы – 21 (10%), верхние отделы – 31 (14,8%), средненижние – 62 (29,6%), тотальные – 39 (18,6%). Диапазоны площади поражения легочной паренхимы на МРТ градировались по МРТ-критериям на четыре группы (менее 25%, 25–50%, 50–75%, более 75%). Было рассчитано снижение суммарной дозы облучения в группе из 450 пациентов: в среднем 2,025 чел.-Зв. за 1,5 мес, из которых 0,077 чел.-Зв пришлись на контрольные исследования.</p></sec><sec><title>Заключение</title><p>Заключение. На основании полученных результатов проведен анализ возможностей метода МРТ в отображении легочных изменений. МРТ-скрининг легких расценен нами как возможная альтернатива компьютерной томографии для динамического контроля в условиях дефицита записи на КТ или невозможности ее выполнения и как инструмент снижения коллективной эффективной дозы облучения населения.</p></sec></abstract><trans-abstract xml:lang="en"><sec><title>Objective</title><p>Objective: to evaluate the role and place of MRI lung screening in the detection of pneumonia and patient routing.</p></sec><sec><title>Material and methods</title><p>Material and methods. 500 MRI tests were performed in the period from November 1, 2020 to December 15, 2020 on the basis of more than 20 diagnostic centers of the federal MRI-Expert network. Two groups were identified. In Group 1 (control, n = 50) MRI studies were compared with CT studies in a single time interval of 0–2 days; 25 patients had a positive PCR test for SARS-CoV-2 and 25 patients were conditionally healthy. In Group 2 (effective, n = 450) mediastinal MRI was performed with lung screening on Philips 1.5 T and Siemens 1.5 T devices. The statistical analysis of the medical data base was performed.</p></sec><sec><title>Results</title><p>Results. During the study, mandatory and additional MRI scanning programs were identified: for Philips 1.5 T tomograph, the mandatory programs are sSSh_fb: tra and cor; THRIVE: tra (inhale/exhale); for Siemens 1.5 T – T2_BLADE: cor, tra, sag. When comparing the visual data of the control group (n = 25) with a positive PCR test in a single time interval of 0–2 days, the fact of detecting MR changes coincided with CT changes in 76% of cases (n = 19). The group of patients were examined by only one method – MRI-screening of the lungs (n = 475), pathological changes in the lungs were detected in 44% (n = 209). Localizations of the pathological changes were as follows: bilateral changes – 70.3% (n = 147), right-side changes – 19.6% (n = 41), left-side changes – 10% (n = 21); lower parts 26.8% (n = 26), average departments – 10% (n = 21), the upper divisions – 14.8% (n = 31), mid-lower 29.6% (n = 62), total – 18.6% (n = 39). The ranges of the area of lesion of the pulmonary parenchyma on MRI were graded according to MRI criteria into 4 groups (&lt; 25%, 25 – 50%, 50 – 75%, &gt; 75%). The collective radiation dose decrease was calculated for a group of patients (n = 450), which averaged 2.025 man-Sv for 1.5 months, of which 0.077 man-Sv were control studies.</p></sec><sec><title>Conclusion</title><p>Conclusion. Based on the results obtained, the analyses of the possibilities of the MRI method in displaying pulmonary changes was performed. The method of MRI screening of the lungs is recognized as a possible alternative to computed tomography for dynamic monitoring in conditions of a shortage of CT records or the inability to perform it, and as a tool to reduce the collective effective dose of radiation to the population.</p></sec></trans-abstract><kwd-group xml:lang="ru"><kwd>магнитно-резонансная томография</kwd><kwd>компьютерная томография</kwd><kwd>МРТ-скрининг</kwd><kwd>в лительные заболевания легких</kwd><kwd>пневмония</kwd><kwd>COVID-19</kwd><kwd>пандемия</kwd><kwd>лучевая диагностика</kwd></kwd-group><kwd-group xml:lang="en"><kwd>magnetic resonance imaging</kwd><kwd>computed tomography</kwd><kwd>MRI screening</kwd><kwd>inflammatory lung diseases</kwd><kwd>pneumonia</kwd><kwd>COVID-19</kwd><kwd>pandemic</kwd><kwd>radiation diagnostics</kwd></kwd-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Использование методов визуализации органов грудной клетки при COVID-19. Краткое руководство. Всемирная организация здравоохранения; 2020. URL: https://apps.who.int/iris/bitstream/handle/10665/332336/WHO-2019-nCoV-Clinical-Radiology_imaging-2020.1-rus.pdf (дата обращения 24.02.2021) (in Russ.).</mixed-citation><mixed-citation xml:lang="en">Use of chest imaging in COVID-19: a rapid advice guide. World Health Organization; 2020. Available at: URL: https://apps.who.int/iris/bitstream/handle/10665/332336/WHO-2019-nCoV-Clinical-Radiology_imaging-2020.1-rus.pdf (дата обращения 24.02.2021) (in Russ.).</mixed-citation></citation-alternatives></ref><ref id="cit2"><label>2</label><citation-alternatives><mixed-citation xml:lang="ru">Временные методические рекомендации. Профилактика, диагностика и лечение новой коронавирусной инфекции (COVID-19). Версия 9. М.: Министерство здравоохранения Российской Федерации; 26.10.2020. URL: https://static-0.minzdrav.gov.ru/system/attachments/attaches/000/052/550/original/%D0%9C%D0%A0_COVID19_%28v9%29.pdf?1603788097 (дата обращения 24.02.2021).</mixed-citation><mixed-citation xml:lang="en">Тemporary guidelines: prevention, diagnosis and treatment of new coronavirus infection (COVID-19). Version 9. Moscow: Ministry Of Health Of The Russian Federation; 26.10.2020 (in Russ.). Available at: URL: https://static-0.minzdrav.gov.ru/system/attachments/attaches/000/052/550/original/%D0%9C%D0%A0_COVID19_%28v9%29.pdf?1603788097 (дата обращения 24.02.2021).</mixed-citation></citation-alternatives></ref><ref id="cit3"><label>3</label><citation-alternatives><mixed-citation xml:lang="ru">Dangis A, Gieraerts C, De Bruecker Y, et al. Accuracy and reproducibility of low-dose submillisievert chest CT for the diagnosis of COVID-19. Radiol Cardiothorac Imag. 2020; 2(2): e200196. https://doi.org/10.1148/ryct.2020200196.</mixed-citation><mixed-citation xml:lang="en">Dangis A, Gieraerts C, De Bruecker Y, et al. Accuracy and reproducibility of low-dose submillisievert chest CT for the diagnosis of COVID-19. Radiol Cardiothorac Imag. 2020; 2(2): e200196. https://doi.org/10.1148/ryct.2020200196.</mixed-citation></citation-alternatives></ref><ref id="cit4"><label>4</label><citation-alternatives><mixed-citation xml:lang="ru">Inui S, Fujikawa A, Jitsu M, et al. Chest CT findings in cases from the cruise ship Diamond Princess with coronavirus disease (COVID-19). Radiol Cardiothorac Imag. 2020; 2(2): e200110. https://doi.org/10.1148/ryct.2020200110.</mixed-citation><mixed-citation xml:lang="en">Inui S, Fujikawa A, Jitsu M, et al. Chest CT findings in cases from the cruise ship Diamond Princess with coronavirus disease (COVID-19). Radiol Cardiothorac Imag. 2020; 2(2): e200110. https://doi.org/10.1148/ryct.2020200110.</mixed-citation></citation-alternatives></ref><ref id="cit5"><label>5</label><citation-alternatives><mixed-citation xml:lang="ru">Yi CA, Lee KS, Han J, et al. 3-T MRI for differentiating inflammation- and fibrosis-predominant lesions of usual and nonspecific interstitial pneumonia: comparison study with pathologic correlation. AJR Am J Roentgenol. 2008; 190(4): 878–5. https://doi.org/10.2214/AJR.07.2833.</mixed-citation><mixed-citation xml:lang="en">Yi CA, Lee KS, Han J, et al. 3-T MRI for differentiating inflammation- and fibrosis-predominant lesions of usual and nonspecific interstitial pneumonia: comparison study with pathologic correlation. AJR Am J Roentgenol. 2008; 190(4): 878–5. https://doi.org/10.2214/AJR.07.2833.</mixed-citation></citation-alternatives></ref><ref id="cit6"><label>6</label><citation-alternatives><mixed-citation xml:lang="ru">Chang S, Hong SR, Kim YJ, et al. Usefulness of thin-section single-shot turbo spin echo with half-Fourier acquisition in evaluation of local invasion of lung cancer. J Magn Reson Imaging. 2014; 41(3): 747–54. https://doi.org/10.1002/jmri.24587.</mixed-citation><mixed-citation xml:lang="en">Chang S, Hong SR, Kim YJ, et al. Usefulness of thin-section single-shot turbo spin echo with half-Fourier acquisition in evaluation of local invasion of lung cancer. J Magn Reson Imaging. 2014; 41(3): 747–54. https://doi.org/10.1002/jmri.24587.</mixed-citation></citation-alternatives></ref><ref id="cit7"><label>7</label><citation-alternatives><mixed-citation xml:lang="ru">Pinal-Fernandez I, Pineda-Sanchez V, Pallisa-Nuñez E, et al. Fast 1.5 T chest MRI for the assessment of interstitial lung disease extent secondary to systemic sclerosis. Clin Rheumatol. 2016; 35(9): 2339–45. https://doi.org/10.1007/s10067-016-3267-0.</mixed-citation><mixed-citation xml:lang="en">Pinal-Fernandez I, Pineda-Sanchez V, Pallisa-Nuñez E, et al. Fast 1.5 T chest MRI for the assessment of interstitial lung disease extent secondary to systemic sclerosis. Clin Rheumatol. 2016; 35(9): 2339–45. https://doi.org/10.1007/s10067-016-3267-0.</mixed-citation></citation-alternatives></ref><ref id="cit8"><label>8</label><citation-alternatives><mixed-citation xml:lang="ru">Zeng J, Liu Z, Shen G, et al. MRI evaluation of pulmonary lesions and lung tissue changes induced by tuberculosis. Int J Infec Dis. 2019; 82: 138–46. https://doi.org/10.1016/j.ijid.2019.03.004.</mixed-citation><mixed-citation xml:lang="en">Zeng J, Liu Z, Shen G, et al. MRI evaluation of pulmonary lesions and lung tissue changes induced by tuberculosis. Int J Infec Dis. 2019; 82: 138–46. https://doi.org/10.1016/j.ijid.2019.03.004.</mixed-citation></citation-alternatives></ref><ref id="cit9"><label>9</label><citation-alternatives><mixed-citation xml:lang="ru">Васильев Ю.А., Бажин А.В., Масри А.Г. и др. (сост.). Лучевая диагностика коронавирусной болезни (COVID-19): магнитно-резонансная томография: препринт № ЦДТ – 2020 – III. Версия от 12.05.2020. Серия «Лучшие практики лучевой и инструментальной диагностики». Вып. 67. М.: ГБУЗ «НПКЦ ДиТ ДЗМ»; 2020: 24 с.</mixed-citation><mixed-citation xml:lang="en">Vasiliev YuA, Bazhin AV, Masri AG, et al. (comp.). Radiation diagnosis of coronavirus disease (COVID-19): magnetic resonance imaging: Preprint no. CDT-2020 – III. Version from 12.05.2020. Series “Best practices of radiation and instrumental diagnostics”. Issue 67. Moscow; 2020: 24 p. (in Russ.)</mixed-citation></citation-alternatives></ref><ref id="cit10"><label>10</label><citation-alternatives><mixed-citation xml:lang="ru">Лесняк В.Н., Журавлева В.А., Аверьянов А.В. Возможности магнитно-резонансной томографии в диагностике поражений легких при COVID-19. Клиническая практика. 2020; 11(2): 51–9. https://doi.org/10.17816/clinpract34843.</mixed-citation><mixed-citation xml:lang="en">Lesnyak VN, Zhuravleva VA, Averyanov AV. The capabilities of MRI in the lung lesions diagnosis in patients with COVID-19. Journal of Clinical Practice. 2020; 11(2): 51–9 (in Russ.). https://doi.org/10.17816/clinpract34843.</mixed-citation></citation-alternatives></ref><ref id="cit11"><label>11</label><citation-alternatives><mixed-citation xml:lang="ru">Rajaram S, Swift AJ, Capener D, et al. Lung morphology assessment with balanced steady-state free precession MR imaging compared with CT. Radiology. 2012; 263(2): 569–77. https://doi.org/10.1148/radiol.12110990.</mixed-citation><mixed-citation xml:lang="en">Rajaram S, Swift AJ, Capener D, et al. Lung morphology assessment with balanced steady-state free precession MR imaging compared with CT. Radiology. 2012; 263(2): 569–77. https://doi.org/10.1148/radiol.12110990.</mixed-citation></citation-alternatives></ref><ref id="cit12"><label>12</label><citation-alternatives><mixed-citation xml:lang="ru">Рассохин В.В., Самарина А.В., Беляков Н.А. и др. Эпидемиология, клиника, диагностика, оценка тяжести заболевания COVID-19 с учетом сопутствующей патологии. ВИЧ-инфекция и иммуносупрессия. 2020; 12(2): 7–30. https://doi.org/10.22328/2077-9828-2020-12-2-7-30.</mixed-citation><mixed-citation xml:lang="en">Rassokhin VV, Samarina AV, Belyakov NA, et al. Epidemiology, clinical picture, diagnostics, assessment of the severity of the disease COVID-19. HIV Infection and Immunosuppressive Disorders. 2020; 12(2): 7–30 (in Russ.). https://doi.org/10.22328/2077-9828-2020-12-2-7-30.</mixed-citation></citation-alternatives></ref></ref-list><fn-group><fn fn-type="conflict"><p>The authors declare that there are no conflicts of interest present.</p></fn></fn-group></back></article>
