title: The relative risks.
authors.forename: E R
authors.initials: ER
authors.lastname: Williams
authors.forename: R A
authors.initials: RA
authors.lastname: Lowe
authors.forename: F S
authors.initials: FS
authors.lastname: Shofer
mesh_terms: D015746:Abdominal Pain / Q000188:drug therapy* / Q000209:etiology; D000701:Analgesics, Opioid / Q000627:therapeutic use*; D016001:Confidence Intervals; D003951:Diagnostic Errors; D006801:Humans; D009020:Morphine / Q000627:therapeutic use*; D012306:Risk
chemical_list: D000701:Analgesics, Opioid; D009020:Morphine