van Schayck Onno C P, Horstman Klasien, Vuurman Eric, de Wert Guido, Kotz Daniel
Department of General Practice, CAPHRI School for Public Health and Primary Care, Maastricht University Medical Centre, Maastricht, The Netherlands.
Addiction. 2014 Aug;109(8):1223-5. doi: 10.1111/add.12569. Epub 2014 Jun 3.