American Thoracic Society/European Respiratory Society statement on pulmonary rehabilitation - Nici, L; Donner, C; Wouters, E; Zuwallack, R; Ambrosino, N; Bourbeau, J; Carone, M; Celli, B; Engelen, M; Fahy, B; Garvey, C; Goldstein, R; Gosselink, R; Lareau, S; MacIntyre, N; Maltais, F; Morgan, M; O’Donnell, D; Prefault, C; Reardon, J; Rochester, C; Schols, A; Singh, S; Troosters, T (Am J Respir Crit Care Med, 2006)