Incidence and risk factors for persistent symptoms in adults previously hospitalized for COVID-19.

"CONFLICT OF INTEREST J. Genuneit reports working as a project manager of unrestricted research grants on the composition of breast milk to the Ulm University and Leipzig University. M.G. Semple reports grants from DHSC National Institute of Health Research UK, grants from Medical Research Council UK, grants from Health Protection Research Unit in Emerging & Zoonotic Infections, University of Liverpool outside the submitted work; he also reports a minority ownership at Integrum Scientific LLC, Greensboro, NC, USA outside the submitted work. T. Vos reports personal fees for work on Global Burden of Disease Study from Bill and Melinda Gates Foundation, outside the submitted work. All other authors report no relevant conflict of interests."

"We thank RFBR, grant 20‐04‐60063 for supporting the work. We would also like to thank UK Embassy in Moscow for providing a grant a grant INT 2021/RSM C 19 01 supporting our project. We are very grateful to the Sechenov University Hospital Network clinical staff and to the patients, carers and families for their kindness and understanding during these difficult times of COVID‐19 pandemic. We would like to express our very great appreciation to ISARIC Global COVID‐19 follow‐up working group for the survey development. We would like to thank Mr Maksim Kholopov for providing technical support in data collection and database administration. We are very thankful to Eat & Talk, Luch, Black Market, FLIP and Academia for providing us the work space in time of need. We are grateful to Ms Asmik Avagyan, Ms Daria Belykh, Ms Ekaterina Belyakova, Ms Anna Berbenyuk, Mr Dmitry Eliseev, Ms Mariia Grosheva, Ms Nelli Khusainova, Ms Maria Kislova, Ms Valeria Klishina, Ms Karina Kovygina, Ms Natalia Kogut, Ms Yana Kohanovskaya, Ms Anastasia Kuznetsova, Ms Elza Lidzhieva, Ms Nadezhda Markina, Mr Georgiy Novoselov, Ms Anna Pushkareva, Ms Olga Romanova, Ms Maria Shoshorina, Ms Jasmin Sibkhan, Ms Olga Spasskaya, Ms Anna Surkova, Ms Nailya Urmantaeva, Ms Ekaterina Varlamova, Ms Margarita Yegiyan, Ms Margarita Zaikina, Ms Anastasia Zorina, Ms Elena Zuikova, Prof Natalia V. Chichkova, Dr Anna V. Buchneva and Prof Natalya Serova for assistance in data extraction, document translation and help during the project. Finally, we would like to extend our gratitude to the Global ISARIC team and ISARIC Co‐ordinating Centre for their continuous support, expertise and for the development of the outbreak ready standardized protocols for the data collection."

"Information about the current condition and persistent symptoms was collected by telephone using the Tier 1 ISARIC Long‐term Follow‐up Study case report form (CRF) developed by the ISARIC Global COVID‐19 follow‐up working group, translated into Russian assessing the patients’ physical and mental health (). Additional information was added from the WHO CRF for Post COVID conditions. The participants were asked to report on dyspnoea, QoL and difficulties in functioning before the COVID‐19 illness and at the time of the interview. We used the British Medical Research Council (MRC) dyspnoea scale, the EuroQoL five‐dimension five‐level (EQ‐5D‐5L) questionnaire, the EuroQoL Visual Analogue Scale (EQ‐VAS) asking participants to score their QoL from 0 (worst imaginable health) to 100 (best imaginable health), UNICEF/Washington disability score and World Health Organisation Disability Assessment Schedule (WHODAS 2.0). The study was registered with EuroQoL as part of the ISARIC collaborative effort (EuroQoL ID 37035)."