1. Department of Rheumatology, University Maastricht, Minderbroedersberg 4-6, 6211 LK Maastricht, Netherlands
2. Department of Internal Medicine-Endocrinology, Leiden University Medical Centre, Albinusdreef 2, 2333 ZA Leiden, Netherlands
3. Department of Rheumatology, Amsterdam University Medical Centre, De Boelelaan 1117 1081 HV Amsterdam, Netherlands
4. Department of Internal Medicine, VieCuri Medical Centre, Tegelseweg 210, 5912 BL Venlo, Netherlands