1. Main Regional Center for Pain Relief & Supportive/Palliative Care, La Maddalena Cancer center, Palermo, Italy
2. Palliative Care Unit, Istituto Scientifico Romagnolo per lo Studio e la Cura dei Tumori (IRST) IRCCS, Meldola, FC, Italy
3. Department of Health Promotion, Maternal and Infant Care, Internal Medicine and Medical Specialties (PROMISE), University of Palermo, Palermo, Italy