1 Department of Anesthesia and Intensive Care, Torino Nord Emergenza San Giovanni Bosco Hospital, Turin, Italy.
2 Laboratory of Clinical Epidemiology, Department of Public Health, Mario Negri IRCCS Institute for Pharmacological Research, Villa Camozzi, Ranica, Bergamo, Italy.
3 Department of Pediatric Anesthesia and Intensive Care, Children Hospital, ASST Spedali Civili di Brescia, Brescia, Italy.