1. a Biostatistics and Clinical Trials Unit, Istituto Scientifico Romagnolo per lo Studio e la Cura dei Tumori, Meldola, Italy
2. b Palliative Care Clinic, Istituto Scientifico Romagnolo per lo Studio e la Cura dei Tumori, Meldola, Italy
3. c Unit of Clinical Epidemiology and Trial Organization, National Cancer Institute, Milan, Italy
4. d Palliative Care Unit (Pain Therapy-Rehabilitation), National Cancer Institute, Milan, Italy
5. e Department of Medical Oncology, Istituto Scientifico Romagnolo per lo Studio e la Cura dei Tumori, Meldola, Italy;