[1] Med Univ Lubeck, Inst Canc Epidemiol, D-23538 Lubeck, Germany
[2] German Canc Res Ctr, Div Clin Epidemiol & Aging Res, D-6900 Heidelberg, Germany
[3] Saarland Canc Registry, Saarbrucken, Germany
[4] BIPS Inst Epidemiol & Prevent Res, Canc Registry Bremen, Bremen, Germany
[5] Inst Med Biostat Epidemiol & Informat, Mainz, Germany
[6] Univ Hosp Schleswig Holstein, Dept Dermatol, Kiel, Germany