1. Youth Health Care Division, Regional Public Health Service South Limburg, Heerlen, Netherlands
2. Department of Social Medicine, CAPHRI School for Public Health and Primary Care, Maastricht University, Maastricht, Netherlands
3. General practice Boesten and general practice Het Eikske, Landgraaf, Netherlands
4. General practice Leliestraat, Helmond, Netherlands
5. Department of Psychiatry and Psychology, MHeNS School for Mental Health and NeuroScience, Maastricht University Medical Centre, Maastricht, Netherlands
6. King's Health Partners Department of Psychosis Studies, Institute of Psychiatry, King's College London, London, UK
7. Department Psychiatry, Brain Center Rudolf Magnus, Utrecht University Medical Centre, Utrecht, Netherlands