1. Department of Rheumatology, Vienna A-1090, Austria; School of Dentistry (R.G.), Department of Oral Surgery, University of Vienna, Vienna A-1090, Austria
2. Department of Clinic of Internal Medicine III (R.G., C.M., K.B., M.-T.K., W.F., L.E.), University of Vienna, Vienna A-1090, Austria
3. Department of Division of Rheumatology (F.P.L.), University Hospitals, KULeuven, Leuven B-3000, Belgium