title: Validity of enriched enrollment, randomized withdrawal trials.
authors.affiliation: Department of Anesthesiology, Louisiana State University Health Science Center, New Orleans, LA, USA.
authors.forename: Xiulu
authors.initials: X
authors.lastname: Ruan
authors.forename: Alan D
authors.initials: AD
authors.lastname: Kaye
mesh_terms: D000700:Analgesics / Q000009:adverse effects* / Q000627:therapeutic use*; D059350:Chronic Pain / Q000188:drug therapy*; D006801:Humans; D016032:Randomized Controlled Trials as Topic / Q000379:methods*; D013375:Substance Withdrawal Syndrome / Q000209:etiology*
chemical_list: D000700:Analgesics