1. Health Professions Research and Development Unit, IRCCS Policlinico San Donato, 20097 San Donato Milanese, Italy
2. Operating Theatre, IRCCS Istituto Ortopedico Galeazzi, 20157 Milan, Italy
3. Department of Public Health, Experimental and Forensic Medicine, Section of Hygiene, University of Pavia, 27100 Pavia, Italy
4. Medical Department, University Hospital of Parma, 43126 Parma, Italy
5. Department of Clinical and Experimental Medicine, University of Messina, 98100 Messina, Italy
6. Department of Biomedical Science for Health, University of Milan, 20133 Milan, Italy