1. Mannheim Institute of Public Health, Social and Preventive Medicine Medical Faculty Mannheim Heidelberg University Mannheim Germany
2. Arbeitsgemeinschaft Dermatologische Prävention Hamburg Germany
3. Centre of Dermatology Elbe Kliniken Buxtehude Buxtehude Germany
4. Department of Community and Behavioral Health College of Public Health East Tennessee State University Johnson City TN U.S.A.
5. Section of Population Science Rutgers Cancer Institute of New Jersey, Rutgers The State University of New Jersey Brunswick NJ U.S.A.