title: Response by authors.
authors.affiliation: Research Centre for Children, Families and Communities, Canterbury Christ Church University, Canterbury, UK. esther.coren@canterbury.ac.uk
authors.forename: Esther
authors.initials: E
authors.lastname: Coren
authors.forename: Rosa
authors.initials: R
authors.lastname: Hossain
mesh_terms: D005260:Female; D014943:Global Health; D040261:Harm Reduction; D018453:Homeless Youth / Q000706:statistics & numerical data*; D006801:Humans; D008297:Male; D012944:Social Support; D019966:Substance-Related Disorders / Q000453:epidemiology*