1. Biostatistics and Medical Informatics Research Group, Department of Public Health, Vrije Universiteit Brussel , Brussels, Belgium
2. Department of Clinical Sciences, Rheumatology Division, Universitair Ziekenhuis Brussel, Vrije Universiteit Brussel , Brussels, Belgium
3. Department of Development and Regeneration, Skeletal Biology and Engineering Research Centre, KU Leuven , Leuven, Belgium
4. Department of Rheumatology, KU Leuven University Hospitals Leuven , Leuven, Belgium