1. 1The Netherlands Cancer Institute, Department of Psychosocial Research and Epidemiology, Amsterdam, The Netherlands.
2. 2University of Twente, Department of Health Technology and Services Research, Enschede, The Netherlands.
3. 3Center for Research in Experimental Economics and Political Decision Making, University of Amsterdam, Amsterdam, the Netherlands.
4. 4Rijnstate Hospital, Arnhem, the Netherlands.