Similar pain in different countries.
Mercadante
S
S
D000701:Analgesics, Opioid / Q000008:administration & dosage*; D004305:Dose-Response Relationship, Drug; D005060:Europe; D006801:Humans; D009369:Neoplasms / Q000150:complications*; D009656:North America; D010146:Pain / Q000188:drug therapy* / Q000209:etiology
D000701:Analgesics, Opioid