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