1. Department of Social Studies, Open University, P.O. Box 2960, 6401 DL Heerlen, the Netherlands; phone: +31-45-5762399 (work), +31-43-3619823 (home); fax: +31-45-5762939;
2. Prevention and Control Program at the Cancer Research Center of Hawaii at the University of Hawaii, Manoa, in Honolulu
3. Department of Health Education and Health Promotion, Maastricht University
4. Department of Psychology, Maastricht University
5. Department of Methodology and Statistics at Maastricht University