1. Department of Dermatology; Erasmus MC Cancer Institute; Rotterdam The Netherlands
2. Department of Research; Netherlands Comprehensive Cancer Organisation (IKNL); Utrecht The Netherlands
3. Department of Public Health; Erasmus MC University Medical Center; Rotterdam The Netherlands
4. Department of Statistics; European Organization for Research and Treatment of Cancer (EORTC); Brussels Belgium
5. Department of Clinical Epidemiology and Biostatistics; Faculty of Medicine; Pontificia Universidad Javeriana; Bogotá Colombia