Affiliation: | 1. Department of Pediatric Rheumatology, University Hospital Leuven, Herestraat 49, 3000, Leuven, Belgium 2. Department of Pediatric Dermatology, University Hospital Leuven, Leuven, Belgium 3. Department of Pediatric Rheumatology, Leiden University Center, Leiden, The Netherlands 4. Department of Pediatric Dermatology, Centre Hospitalier du Luxembourg, Luxembourg, Luxembourg 5. Department of Pediatric Neurology, University Hospital Leuven, Leuven, Belgium
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