1. CAPHRI School for Public Health and Primary Care, Department of Family Medicine; Maastricht University; Maastricht the Netherlands
2. General Practice Research Unit, Department of Community Medicine; The Arctic University of Norway; Tromsø Norway
3. MHeNS School for Mental Health and Neuroscience, Department of Psychiatry and Neuropsychology; Maastricht University; Maastricht the Netherlands
4. Eindhoven Corporation of Primary Health Care Centres (SGE); Eindhoven the Netherlands
5. Institute of General Practice, Addiction Research and Clinical Epidemiology unit; Medical Faculty of the Heinrich-Heine University Düsseldorf; Düsseldorf Germany