1 Unit of Respiratory Rehabilitation, Fondazione Don Carlo Gnocchi, Milan, Italy.
2 Unit of Respiratory Rehabilitation, Fondazione Don Carlo Gnocchi, Milan, Italy - antonellonicolini@gmail.com.
3 AVIS Comunale Milano, Milan, Italy.
4 Unit of Sleep and Ventilation, Department of Pneumology, Marqués de Valdecilla University Hospital, Cantabria University, Santander, Spain.
5 Unit of Respiratory Diseases, Hospital of Sestri Levante, Sestri Levante, Genoa, Italy.
6 Unit of Pneumology, Department of Cardiovascular and Thoracic, Molinette Hospital, Città della Salute e della Scienza, University of Turin, Turin, Italy.