title: Authors' reply.
authors.affiliation: Sarah Byford, Centre for the Economics of Mental and Physical Health, Box P024, Institute of Psychiatry, De Crespigny Park, London SE5 8AF, UK. Email: s.byford@kcl.ac.uk; Barbara Barrett, Centre for the Economics of Mental and Physical Health, Nicola Metrebian, Addictions Department, National Addiction Centre, Institute of Psychiatry, King's College London, UK; Teodora Groshkova, European Monitoring Centre for Drugs and Drug Addiction, Lisbon, Portugal; Maria Cary, Centre for the Economics of Mental and Physical Health, Vikki Charles, Addictions Department, National Addiction Centre, Institute of Psychiatry, King's College London, UK; Nicholas Lintzeris, The Langton Centre, South Eastern Sydney Local Health District, NSW Health, Australia; John Strang, Addictions Department, National Addiction Centre, Institute of Psychiatry, King's College London, UK.
authors.forename: Sarah
authors.initials: S
authors.lastname: Byford
authors.forename: Barbara
authors.initials: B
authors.lastname: Barrett
authors.forename: Nicola
authors.initials: N
authors.lastname: Metrebian
authors.forename: Teodora
authors.initials: T
authors.lastname: Groshkova
authors.forename: Maria
authors.initials: M
authors.lastname: Cary
authors.forename: Vikki
authors.initials: V
authors.lastname: Charles
authors.forename: Nicholas
authors.initials: N
authors.lastname: Lintzeris
authors.forename: John
authors.initials: J
authors.lastname: Strang
mesh_terms: D000701:Analgesics, Opioid / Q000191:economics*; D003932:Heroin / Q000191:economics*; D006556:Heroin Dependence / Q000534:rehabilitation*; D006801:Humans; D008691:Methadone / Q000191:economics*; D058850:Opiate Substitution Treatment / Q000191:economics*; D017063:Outcome Assessment, Health Care / Q000706:statistics & numerical data*
chemical_list: D000701:Analgesics, Opioid; D003932:Heroin; D008691:Methadone