1. Department of Dermatology; Medical University of Graz; Graz Austria
2. Department of Dermatology; State Hospital Klagenfurt; Klagenfurt Austria
3. Department of Internal Medicine; Division of Rheumatology and Immunology; Medical University of Graz; Graz Austria
4. Institute for Medical Informatics; Statistics and Documentation; Medical University of Graz; Graz Austria