1. Department of Internal Medicine, Rheumatology Unit, Azienda USL‐Toscana Centro Hospital San Giovanni di Dio Florence Italy
2. Emergency Department and Covid Unit, Azienda USL‐Toscana Centro Hospital San Giovanni di Dio Florence Italy
3. Rheumatology Unit, Department of Clinical and Experimental Medicine University of Florence Florence Italy
4. Department of laboratory, Immunology and Allergology Laboratory, Azienda USL‐Toscana Centro Hospital San Giovanni di Dio Florence Italy