1. Fiom , Research Department, ‘s-Hertogenbosch , The Netherlands
2. University of Groningen, University Medical Center Groningen, Department of General Practice and Elderly Care Medicine , Groningen , The Netherlands
3. Amsterdam University Medical Center, Vrije Universiteit Amsterdam, Department of Midwifery Science, AVAG, Amsterdam Public Health , Amsterdam , The Netherlands
4. Department of Sociology and Interuniversity Centre for Social Science Theory and Methodology (ICS), University of Groningen , Groningen , The Netherlands
5. Accare, University Centre for Child and Adolescent Psychiatry , Groningen , The Netherlands