title: Reply to Warnakulasuriya et al.
authors.affiliation: Discipline of Pharmacology, University of Adelaide, Adelaide, SA, Australia.
authors.forename: Linda R
authors.identifier: http://orcid.org/0000-0002-9124-4056
authors.initials: LR
authors.lastname: Gowing
authors.affiliation: Department of Epidemiology and Public Health, University College London, London, UK.
authors.forename: Robert
authors.initials: R
authors.lastname: West