1 PharmacoTherapy, Epidemiology, and Economics, Groningen Research Institute of Pharmacy, University of Groningen, Groningen, the Netherlands. Electronic address: j.van.der.schans@rug.nl.
2 PharmacoTherapy, Epidemiology, and Economics, Groningen Research Institute of Pharmacy, University of Groningen, Groningen, the Netherlands.
3 Department of Child and Adolescent Psychiatry, University Medical Center Groningen, University of Groningen, Groningen, the Netherlands.
4 Medical Center Leeuwarden, Leeuwarden, the Netherlands.