1Department of Internal Medicine, Division of Rheumatology, Maastricht University Medical Center, the Netherlands; 2Case Western Reserve University, Cleveland, OH, USA. Sjef van der Linden, MD, PhD Muhammad A Khan, MD, FRCP, MACP Please address correspondence to: Dr Sjef van der Linden, Department of Internal Medicine, Division of Rheumatology, Maastricht University Medical Center, P.O. Box 580...