1 Head Nurse, General Adult and Paediatric Intensive Care Unit, Fondazione IRCCS San Gerardo dei Tintori, Via Pergolesi 33, 20900 Monza, Italy. Electronic address: alberto.lucchini@irccs-sangerardo.it.
2 Department of Biomedicine and Prevention, University of Rome "Tor Vergata", Via Montpellier, 1, 00133 Rome, Italy.
3 Department of Health Sciences, University of Florence, Viale GB Morgagni, 48, 50134 Florence, Italy.