title: An international multicentre validation study of a pain classification system for cancer patients.
authors.forename: Stein
authors.initials: S
authors.lastname: Kaasa
mesh_terms: D006801:Humans; D015337:Multicenter Studies as Topic; D009369:Neoplasms / Q000150:complications*; D010146:Pain / Q000145:classification* / Q000209:etiology; D010147:Pain Measurement; D054928:Validation Studies as Topic