1. Department of Research; Comprehensive Cancer Centre The Netherlands; Utrecht The Netherlands
2. Department of Epidemiology; University of Groningen, University Medical Center Groningen; Groningen The Netherlands
3. Department of Public Health; Erasmus University Medical Center; Rotterdam The Netherlands
4. Department of Research; Comprehensive Cancer Center South; Eindhoven The Netherlands
5. Department of Otorhinolaryngology/Head and Neck Surgery; Radboud University Nijmegen Medical Centre; Nijmegen The Netherlands