1. Department of Paediatrics Dijklander Hospital Hoorn Hoorn The Netherlands
2. Department of Nuclear Medicine Dijklander Hospital Hoorn Hoorn The Netherlands
3. Department of Pediatric Immunology, Rheumatology and Infectious Diseases Emma Children's Hospital, Amsterdam UMC, University of Amsterdam Amsterdam The Netherlands
4. Department of Paediatric Rheumatology and Immunology Wilhelmina Children's Hospital Utrecht Utrecht University Utrecht The Netherlands
5. Department of General Practice Amsterdam UMC, University of Amsterdam Amsterdam The Netherlands