1. Medical Poliklinik, Ludwig‐Maximilians‐University of Munich, Munich, Germany
2. Institute of Pathology, Ludwig‐Maximilians‐University of Munich, Munich, Germany
3. Clinic and Poliklinik for Dermatology, Technical University of Munich, Munich, Germany
4. Millennium Pharmaceuticals, Cambridge, MA, USA
5. Department of Pediatrics, Technical University of Munich, Munich, Germany