1. Department of Internal Medicine, VieCuri Medical Centre, P.O. Box 1926, 5900 BX Venlo, The Netherlands
2. Department of Internal Medicine, NUTRIM School for Nutrition, Toxicology and Metabolism, Maastricht University Medical Centre (MUMC), P.O. Box 616, 6200 MD Maastricht, The Netherlands
3. Department of Internal Medicine, Subdivision Rheumatology, CAPHRI, Maastricht University Medical Centre (MUMC), P.O. Box 616, 6200 MD Maastricht, The Netherlands
4. Biomedical Research Centre, Hasselt University, Agoralaan, Gebouw D, 3590 Diepenbeek, Belgium
5. Department of Surgery, VieCuri Medical Centre, P.O. Box 1926, 5900 BX Venlo, The Netherlands
6. Department of Orthopaedic Surgery, VieCuri Medical Centre, P.O. Box 1926, 5900 BX Venlo, The Netherlands