Prevalence of COVID-19 in patients with rheumatoid arthritis (RA) already treated with hydroxychloroquine (HCQ) compared with HCQ-naive patients with RA: a multicentre cross-sectional study

Affiliations

• ¹ Tuberculosis and Lung Disease Research Center, Tabriz University of Medical Sciences, Tabriz, East Azerbaijan, Iran.
• ² Pharmaceutical Analysis Research Center, Tabriz University of Medical Sciences, Tabriz, East Azerbaijan, Iran.
• ³ Connective Tissue Diseases Research Center, Tabriz University of Medical Sciences, Tabriz, East Azerbaijan, Iran.
• ⁴ Autoimmune Diseases Research Center, Kashan University of Medical Sciences, Kashan, Iran.
• ⁵ Tabriz Health Services Management Research Center, Tabriz University of Medical Sciences, Tabriz, East Azerbaijan, Iran.
• ⁶ Rheumatology Section, Department of Internal Medicine, AJA University of Medical Sciences, Tehran, Tehran, Iran.
• ⁷ Physical Medicine and Rehabilitation Research Center, Aging Research Institute, Tabriz University of Medical Sciences, Tabriz, East Azerbaijan, Iran.
• ⁸ Connective Tissue Diseases Research Center, Tabriz University of Medical Sciences, Tabriz, East Azerbaijan, Iran dr_khabbazi@yahoo.com.