1. Public Health Office, Local Health Unit 2 Marca Trevigiana, 31100 Treviso, Italy
2. Department of Biomedical Sciences, University of Sassari, 07100 Sassari, Italy
3. University Hospital of Sassari, 07100 Sassari, Italy
4. Home Care Unit, Ventilated Patients with High Care Complexity, Health District of Sassari, 07100 Sassari, Italy
5. Health District II, ASL Roma 1, 00185 Rome, Italy
6. Department of Medicine, Surgery and Pharmacy, University of Sassari, 07100 Sassari, Italy