1. Parnassia Psychiatric Institute; The Hague the Netherlands
2. Department of Sociology; University of Groningen; Groningen the Netherlands
3. Interuniversity Center for Social Science Theory and Methodology; Groningen the Netherlands
4. Department of Psychiatry; University of Groningen, University Medical Center Groningen; Groningen the Netherlands
5. Department of Epidemiology; Columbia University, Mailman School of Public Health; New York New York