1. Department of Medical Informatics, Biometry and Epidemiology; University of Erlangen/Nürnberg; D-91054 Erlangen Germany
2. Department of Dermatology, Environmental Medicine and Health Theory; University of Osnabrück; D-49090 Osnabrück Germany
3. Information Network of Departments of Dermatology; University of Göttingen; D-37075 Goettingen Germany