Author information:
(1)Department of Rheumatology and Clinical Immunology, University of Groningen, 
University Medical Center Groningen, Groningen, The Netherlands, Division of 
Rheumatology, Department of Internal Medicine, Seoul National University College 
of Medicine, Seoul, Korea, Department of Pathology and Medical Biology and 
Department of Laboratory Medicine, Section Medical Immunology, University of 
Groningen, University Medical Center Groningen, Groningen, The Netherlands 
Department of Rheumatology and Clinical Immunology, University of Groningen, 
University Medical Center Groningen, Groningen, The Netherlands, Division of 
Rheumatology, Department of Internal Medicine, Seoul National University College 
of Medicine, Seoul, Korea, Department of Pathology and Medical Biology and 
Department of Laboratory Medicine, Section Medical Immunology, University of 
Groningen, University Medical Center Groningen, Groningen, The Netherlands 
k.s.m.van.der.geest@umcg.nl.
(2)Department of Rheumatology and Clinical Immunology, University of Groningen, 
University Medical Center Groningen, Groningen, The Netherlands, Division of 
Rheumatology, Department of Internal Medicine, Seoul National University College 
of Medicine, Seoul, Korea, Department of Pathology and Medical Biology and 
Department of Laboratory Medicine, Section Medical Immunology, University of 
Groningen, University Medical Center Groningen, Groningen, The Netherlands.