[1] Natl Inst Hlth, Yerevan, Armenia
[2] Eurasian Assoc Internal Med, ACTIV SARS CoV-2 Working Grp, Yerevan, Armenia
[3] Eurasian Assoc Internal Med, ACTIV SARS CoV-2 Working Grp, Soci, Russia
[4] Eurasian Assoc Internal Med, ACTIV SARSCoV2 Working Grp, Moscow, Russia
[5] Eurasian Assoc Internal Med, ACTIV SARSCoV2 Working Grp, Rostov Na Donu, Russia
[6] Eurasian Assoc Internal Med, ACTIV SARS CoV-2 Working Grp, Nizhnii Novgorod, Russia
[7] Eurasian Assoc Internal Med, ACTIV SARS CoV-2 Working Grp, St Petersburg, Russia