RABBIT is the German register for the long-term observation of therapy with biologics, biosimilars and Janus kinase (JAK) inhibitors in adult patients with rheumatoid arthritis. The project was initiated in 2001 by the German Rheumatology Research Center (DRFZ) in coordination with the German Society for Rheumatology, the Professional Association of German Rheumatologists and the Competence Network Rheumatology. RABBIT is involved in international research and co-operates with other European ...