1. Department of Rheumatology, ZNA Jan Palfijn Hospital, Antwerp, Belgium
2. Department of Rheumatology, Gasthuisberg University Hospital, Leuven, Belgium
3. Department of Pathology, Centrum voor Medische Analyse Centraal Laboratorium Antwerpen, Antwerp, Belgium
4. Department of Pathology, Antwerp University Hospital, Antwerp, Belgium
5. Department of Dermatology, Antwerp University Hospital, Antwerp, Belgium
6. Department of Hematology, Antwerp University Hospital, Antwerp, Belgium