title: Cancer pain classification: a controversial issue.
authors.affiliation: Pain Therapy and Palliative Care Division, National Cancer Institute of Milan, MilanItaly.
authors.forename: Vittorio
authors.initials: V
authors.lastname: Ventafridda
authors.forename: Augusto
authors.initials: A
authors.lastname: Caraceni
mesh_terms: D006801:Humans; D009369:Neoplasms / Q000503:physiopathology*; D010148:Intractable Pain / Q000145:classification* / Q000503:physiopathology