title: Opioid analgesics - Authors' reply.
authors.affiliation: Secretariat International Narcotics Control Board, United Nations Office, A-1400 Vienna, Austria. Electronic address: stefano.berterame@incb.org.
authors.forename: Stefano
authors.initials: S
authors.lastname: Berterame
authors.affiliation: Secretariat International Narcotics Control Board, United Nations Office, A-1400 Vienna, Austria.
authors.forename: Juliana
authors.initials: J
authors.lastname: Erthal
authors.affiliation: International Narcotics Control Board, United Nations Office, Vienna, Austria; National Drug and Alcohol Research Centre, Faculty of Medicine, University of New South Wales, Sydney, NSW, Australia.
authors.forename: Richard P
authors.initials: RP
authors.lastname: Mattick