1. Department of Public Health, Erasmus MC, University Medical Center Rotterdam, the Netherlands.
2. Department of Medical Oncology, Erasmus MC, University Medical Center Rotterdam, the Netherlands.
3. Julius Center, University Medical Center Utrecht, the Netherlands.
4. Department of Sociology and Social Research, University of Trento, Italy.
5. Department of Health Sciences, Metamedica, University Medical Center Groningen, University of Groningen, The Netherlands.