1 Department of Pathophysiology and Transplantation, University of Milan, and SC Anesthesia and Intensive Care, San Paolo Hospital - Polo Universitario, ASST dei Santi Paolo e Carlo, Milan, Italy. Electronic address: giovanni.mistraletti@unimi.it.
2 Unit of Pediatric Anesthesia and Intensive Care, Children's Hospital, ASST Spedali Civili, Brescia, Italy.