1 Pediatric Intensive Care Unit, Department of Woman's, Child's and Urological Diseases, S. Orsola-Malpighi Polyclinic University Hospital, Bologna, Italy - mariacristina.mondardini@aosp.bo.it.
2 Department of Anesthesia, Intensive Care and Emergency, Maggiore Polyclinic Hospital, Ca' Granda IRCCS and Foundation, Milan, Italy.