The relative risks.
Williams
E R
ER
Lowe
R A
RA
Shofer
F S
FS
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
D000701:Analgesics, Opioid; D009020:Morphine