1. Physical Medicine and Rehabilitation Department; Mataró Hospital; Mataró
2. Pneumology Department; Mataró Hospital; Mataró
3. Physical Medicine and Rehabilitation Department; Hospitalet General Hospital; Hospital de LLobregat; Barcelona; Spain
4. Pneumology Department; University Hospital Vall d'Hebron; Ciber de Enfermedades Respiratorias (CIBERES); Barcelona; Spain