[1] Eberhard Karls Univ Tubingen, Dept Dermatol, Ctr Dermatooncol, Tubingen, Germany
[2] Portuguese Air Force Hlth Care Direct, Lisbon, Portugal
[3] Univ Hosp Schleswig Holstein, Inst Social Med & Epidemiol, Lubeck, Germany
[4] Saarland Canc Registry, Saarbrucken, Germany
[5] Eberhard Karls Univ Tubingen, Inst Clin Epidemiol & Appl Biostat, Tubingen, Germany