3 Horst-Schmidt-Kliniken, Universitätsmedizin der Johannes Gutenberg-Universität Mainz, Wiesbaden, Germany.
4 Internal Medicine and Rheumatology, Klinikum Rosenhöhe, Universität Bielefeld, Bielefeld, NRW, Germany.
5 Medical Department I, Rheumatology, Department of Gastroenterology & Infectiology, Charité- University Medical Center,Campus Benjamin Franklin, Berlin, Germany.