1. Department of Dermatology; Erasmus University Medical Center; PO Box 2040 3000 CA Rotterdam The Netherlands
2. Department of Internal Medicine; Maasstad Hospital; PO Box 9100 3007 AC Rotterdam The Netherlands
3. Department of Pharmacology and Toxicology; Leiden University Medical Center; Leiden The Netherlands
4. Department of Public Health; Erasmus University Medical Center; PO Box 2040 3000 CA Rotterdam The Netherlands
5. Eindhoven Cancer Registry; PO Box 231 5600 AE Eindhoven The Netherlands