Maintenance work on the ZORA database servers is scheduled for Thursday 25th July 2019 from 19:00-20:00. During this period ZORA and JDB will not be available. Thank you for your understanding.
Uchtenhagen, Ambros (2014). A short history of opioid maintenance treatment - how a treatment was born and spread around the World. In: Bruinsma, Gerben; Weisbrud, David. Encyclopedia of Criminology and Criminal Justice. New York: Springer New York, 1187-1190.