1 Division of Anesthesiology and Pain Medicine, Istituto Nazionale Tumori- IRCCS Fondazione G. Pascale, Naples, Italy - m.cascella@istitutotumori.na.it.
2 Department of Anesthesiology and Critical Care, ARCO, Bambino Gesù Children's Hospital, Rome, Italy.
3 Unit of Pain Medicine, IRCCS Centro di Riferimento Oncologico (CRO), Aviano, Pordenone, Italy.
4 Unit of Anesthesiology, Division of Intensive Care and Pain, Hospital of Latisana, Udine, Italy.
5 Unit of Pain Medicine, European Institute of Oncology, Milan, Italy.
6 Division of Anesthesiology and Pain Medicine, Istituto Nazionale Tumori- IRCCS Fondazione G. Pascale, Naples, Italy.
7 Department of Anesthesiology, Resuscitation and Intensive Care, University of Chieti-Pescara, Pescara, Italy.
8 SC of Epidemiology and Biostatistics, Istituto Nazionale Tumori- IRCCS Fondazione G. Pascale, Naples, Italy.
9 Department of Anesthesiology, Intensive Care and Pain Treatment, University of L'Aquila, L'Aquila, Italy.