1. Physical Medicine and Rehabilitation, Fondazione IRCCS Policlinico San Matteo; University of Pavia; Pavia Italy
2. Service of Biometry and Clinical Epidemiology, Fondazione IRCCS Policlinico San Matteo; 27100 Pavia Italy
3. Respiratory Disease Unit, Fondazione IRCCS Policlinico San Matteo; University of Pavia; Pavia Italy
4. Division of Cardiac Surgery, Fondazione IRCCS Policlinico San Matteo; University of Pavia; Pavia Italy
5. Department of Cardiology; Fondazione IRCCS Policlinico San Matteo; Pavia Italy