1. Hospital Garcia de Orta; Department of Rheumatology; Almada Portugal
2. Academic Medical Centre; Department of Clinical Immunology & Rheumatology; Amsterdam Netherlands
3. Medical University Vienna; Division of Rheumatology, Department of Internal Medicine 3; Waehringer Guertel 18-20 Vienna Austria 1090
4. Leiden University Medical Center; Department of Rheumatology; PO Box 9600 Leiden Netherlands 2300 RC
5. Maastricht University Medical Center; Department of Medicine, Division of Rheumatology; P. Debyeplein 15 Maastricht Limburg Netherlands 6201AZ
6. Department of Epidemiology and Preventive Medicine, School of Public Health and Preventive Medicine, Monash University; Monash Department of Clinical Epidemiology at Cabrini Hospital; Suite 41, Cabrini Medical Centre 183 Wattletree Road Malvern Victoria Australia 3144
7. Atrium Medical Centre; Department of Rheumatology; P. Debyeplein 15 Heerlen Limburg Netherlands 6201AZ