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