title: All failures count.
authors.affiliation: Continental Anesthesia, Chicago, Illinois, USA.
authors.forename: Andrew
authors.initials: A
authors.lastname: Engel
mesh_terms: D000701:Analgesics, Opioid / Q000008:administration & dosage*; D059350:Chronic Pain / Q000188:drug therapy*; D004361:Drug Tolerance; D005260:Female; D006801:Humans; D006853:Hydrocodone / Q000008:administration & dosage*; D017116:Low Back Pain / Q000188:drug therapy*; D008297:Male; D012720:Severity of Illness Index
chemical_list: D000701:Analgesics, Opioid; D006853:Hydrocodone