Preliminary recommendations of the German Society of Rheumatology (DGRh eV) for the management of patients with inflammatory rheumatic diseases during the SARS-CoV-2/COVID-19 pandemic. Issue 6 (28th April 2020) - Schulze-Koops, Hendrik; Specker, Christof; Iking-Konert, Christof; Holle, Julia; Moosig, Frank; Krueger, Klaus