[1] La Maddalena Canc Ctr, Anesthesia & Intens Care Unit, I-90146 Palermo, Italy
[2] La Maddalena Canc Ctr, Pain Relief & Support Care Unit, I-90146 Palermo, Italy
[3] Univ Palermo, Dept Palliat Med, Palermo, Italy
[4] Azienda Sanit Prov, Hosp, Messina, Italy