1 Department of Pediatric Rheumatology and Immunology, University Hospital Muenster, Muenster 48149, Germany. Electronic address: dfoell@uni-muenster.de.
2 Department of Ophthalmology, St Franziskus Hospital, Muenster, Germany; Department of Ophthalmology, University of Duisburg-Essen, Essen, Germany.