Institution: | (1) Rheumatology and Clinical Immunology, University Medical Center Groningen, University of Groningen, P.O. Box 30.001, 9700, RB, Groningen, Netherlands;(2) Laboratory Medicine, University Medical Center Groningen, P.O. Box 30.001, 9700, RB, Groningen, Netherlands;(3) Epidemiology, University Medical Center Groningen, P.O. Box 30.001, 9700, RB, Groningen, Netherlands;(4) Rheumatology, Medical Center Leeuwarden, P.O. Box 888, 8901, BR, Leeuwarden, Netherlands |