1 Section of Anesthesia, Intensive Care and Pain Medicine, Ospedale di Città di Castello, Città di Castello, Perugia, Italy.
2 Section of Anesthesia and Intensive Care, M. Bufalini Hospital, AUSL Romagna, Cesena, Forlì-Cesena, Italy - domenicopietro.santonastaso@auslromagna.it.
3 Breast Unit, Department of Surgery, Città di Castello Hospital, Città di Castello, Perugia, Italy.
4 Section of Anesthesia, Analgesia and Intensive Care, Department of Surgical and Biomedical Sciences, Santa Maria della Misericordia Hospital, University of Perugia, Perugia, Italy.
5 Section of Anesthesia, Intensive Care and Pain Medicine, San Salvatore Hospital, L'Aquila, Italy.
6 Section of Anesthesia, Department of Surgical and Biomedical Sciences, Analgesia and Intensive Care, University of Perugia, Perugia, Italy.