| Summary: | Jonas F Ludvigsson,1–4 Ronald van Vollenhoven5 1Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, 2Department of Pediatrics, Örebro University Hospital, Örebro, Sweden; 3Division of Epidemiology and Public Health, School of Medicine, University of Nottingham, Nottingham, UK; 4Department of Medicine, Celiac Disease Center, Columbia University College of Physicians and Surgeons, New York, NY, USA; 5Department of Rheumatology, Amsterdam Rheumatology & Immunology Center, Amsterdam, the NetherlandsRelapsing polychondritis (RP) is by no means an unknown disease, and already 30 years ago Michet et al1 had presented results from a single-center study of 112 patients with RP. In contrast to the earlier study,1 the study by Horvath et al2 published in Clinical Epidemiology allows some interesting revelations.
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