Svitlana Trypilka1, Iryna Golovach2, Yelyzaveta Yehudina3. 1. Clinic of Rheumatology, Communal Non-Commercial Enterprise of Kharkov Regional Council "Regional Clinical Hospital", Kharkiv, Ukraine. 2. Department of Rheumatology, «Feofaniya» Clinical Hospital State Management of Affairs, Kyiv, Ukraine. 3. Department of Rheumatology, Clinic of Modern Rheumatology, Kyiv, Ukraine.