1. Chronic opioid therapy for non-cancer pain
B.-J. Collett 
British Journal of Anaesthesia 
Volume 87, Issue 1, Pages (July 2001)
DOI: /bja/
Copyright © 2001 British Journal of Anaesthesia Terms and Conditions

2. Fig 1
Annual numbers of new users of pain relievers non-medically 1990–1998. Source: Substance Abuse and Mental Health Services Administration, Office of Applied Studies, National Household Survey on Drug Abuse, 1999.
British Journal of Anaesthesia  , DOI: ( /bja/ )
Copyright © 2001 British Journal of Anaesthesia Terms and Conditions