title: Limited evidence: many pitfalls.
authors.affiliation: Northumberland Tyne and Wear Drug and Alcohol Service, Newcastle upon Tyne, NE2 2SQ, UK. eilish.gilvarry@ntw.nhs.uk
authors.forename: Eilish
authors.initials: E
authors.lastname: Gilvarry
mesh_terms: D006801:Humans; D012196:Review Literature as Topic; D012572:School Health Services; D013334:Students; D015813:Substance Abuse Detection / Q000379:methods*; D019966:Substance-Related Disorders / Q000517:prevention & control*