1. Clinici Scientifici Maugeri, IRCCS, Cardiorespiratory Rehabilitation Unit, Via Camaldoli 64, 20138 Milan, Italy
2. Department of Psychology, University of Bologna, Bologna, Milan, Italy
3. Medicine and Cardiorespiratory Rehabilitation Department, Istituti Clinici Scientifici Maugeri, IRCCS, Scientific Institute of Tradate, Milan, Italy
4. Cardiorespiratory Rehabilitation Unit, Istituti Clinici Scientifici Maugeri, IRCCS, Scientific Institute of Milan, Milan, Italy
5. Psychology Unit, Istituti Clinici Scientifici Maugeri, IRCCS, Scientific Institute of Milan, Milan, Italy