1 Department of Public Health, Erasmus MC University Medical Center, PO Box 2040, 3000 CA, Rotterdam, The Netherlands.
2 Department of Clinical Epidemiology and Biostatistics, Pontificia Universidad Javeriana, Hospital San Ignacio. Piso 2, Bogota, Cra 7 No 40-62, Bogota, Colombia.
3 Department of Dermatology, Erasmus MC University Medical Center, PO Box 2040, 3000 CA, Rotterdam, The Netherlands.
4 Department of Research, Netherlands Comprehensive Cancer Center, PO Box 19079, 3501 DB, Utrecht, The Netherlands.