1. Department of Anesthesiology and Critical Care Medicine, Pediatric Intensive Care Unit Meyer Children's Hospital IRCCS Florence Italy
2. Unit of Medical Statistics, Department of Clinical and Experimental Medicine University of Pisa Pisa Italy
3. Department of Statistics, Computer Science and Applications “G. Parenti” University of Florence Florence Italy
4. Pediatric Intensive Care Unit, Hospital Department of Women's and Children's IRCCS Azienda Ospedaliero‐Universitaria Bologna Italy
5. Anesthesia and Critical Care Medicine Bambino Gesù Children's Hospital, IRCCS Rome Italy
6. Department of Anesthesiology and Critical Care Medicine, Pediatric Intensive Care Unit Ospedale dei Bambini ASST‐Spedali Civili Brescia Italy
7. Department of Medical and Surgical Medicine, Intensive Care Unite 1 AOU Policlinico San Marco Catania Italy
8. Pediatric Intensive Care Unit IRCCS Ca' Granda Ospedale Maggiore Policlinico Milan Italy
9. Pediatric Intensive Care Unit and Trauma Center ARNAS Civico e Di Cristina Palermo Italy
10. Pediatric Intensive Care Unit, Department of Women's and Children's Health University Hospital of Padova Padua Italy
11. Anesthesiology and Critical Care Medicine, Department of Health Science University of Florence Florence Italy