1. Friuli Riabilitazione, 33080 Roveredo in Piano, Italy
2. Pain Medicine, Hospital of Latisana, 33053 Latisana, Italy
3. Department of Economics, Ca Foscari University of Venice, 30123 Venice, Italy
4. Department of Management, Ca Foscari University of Venice, 30123 Venice, Italy
5. Papa Giovanni XXIII Hospital, 31050 Monastier, Italy
6. Pain Medicine, IRCCS C.R.O. National Cancer Institute of Aviano, 33081 Aviano, Italy