1. Division of Molecular Genetic Epidemiology, German Cancer Research Center, Im Neuenheimer Feld 580, 69120 Heidelberg, Germany.
2. Department of Dermatology, University Hospital Essen, 45122 Essen, Germany.
3. Institute of Human Genetics, University of Heidelberg, 69120 Heidelberg, Germany.
4. Department of Dermatology, Instituto Valenciano de Oncologia, Valencia, Spain.
5. Center for Primary Health Care Research, Lund University, Malmö, Sweden.