title: Comment on "nonresponse and selection bias in treatment follow-up studies".
authors.forename: P M
authors.initials: PM
authors.lastname: Flynn
authors.forename: D D
authors.initials: DD
authors.lastname: Simpson
authors.forename: M D
authors.initials: MD
authors.lastname: Anglin
authors.forename: R L
authors.initials: RL
authors.lastname: Hubbard
mesh_terms: D006801:Humans; D017063:Outcome Assessment, Health Care / Q000379:methods*; D018579:Patient Selection; D012107:Research Design; D015983:Selection Bias; D019966:Substance-Related Disorders / Q000628:therapy*