1. Mannheim Institute of Public Health; Social and Preventive Medicine; Medical Faculty Mannheim; Heidelberg University; Ludolf-Krehl-Str. 7-11 Mannheim D-68167 Germany
2. Departments of Medicine, Epidemiology and Biostatistics; Case Comprehensive Cancer Center; Case Western Reserve University; Cleveland OH U.S.A
3. Dermatology Centre; Elbeklinikum Buxtehude; Buxtehude Germany
4. Association of Dermatological Prevention; Hamburg Germany
5. European Society of Skin Cancer Prevention; c/o Elbekliniken; Buxtehude Germany