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.
Maryam KhoubnasabjafariAbolghasem JouybanAida Malek MahdaviLeila NamvarKamal EsalatmaneshMehrzad HajialiloSaeed DastgiriMohsen SoroushSaeid SafiriAlireza KhabbaziPublished in: Postgraduate medical journal (2022)