Federica Dellafiore1, Anna Maria Grugnetti2, Rosario Caruso3, Giuseppe Prinzivalli4, Michele Luca5, Giuseppina Grugnetti6, Silvia Belloni7,8, Arianna Magon1, Cristina Arrigoni9. 1. Health Professions Research and Development Unit, IRCCS Policlinico San Donato, San Donato Milanese, Milano, Italy. 2. Health department, Fondazione IRCCS Policlinico San Matteo, Pavia, Italy. 3. Health Professions Research and Development Unit, IRCCS Policlinico San Donato, San Donato Milanese, Milano, Italy rosario.caruso@grupposandonato.it. 4. Neonatal intensive care unit, Hospital Papa Giovanni XXIII, Bergamo, Italy. 5. Department of Surgical Sciences, Fondazione IRCCS Policlinico San Matteo, Pavia, Italy. 6. Nursing Office, Fondazione IRCCS Policlinico San Matteo, Pavia, Italy. 7. Humanitas Clinical and Research Center-IRCCS-, Via Manzoni 56, 20089 Rozzano, Milan, Italy. 8. Department of Biomedicine and Prevention, University of Rome Tor Vergata, Rome, Italy. 9. Department of Public Health, Experimental and Forensic Medicine, Section of Hygiene, University of Pavia, Pavia, Italy.