Exercise prescription for hospitalized people with chronic obstructive pulmonary disease and comorbidities: a synthesis of systematic reviews.
Reid WD, Yamabayashi C, Goodridge D, Chung F, Hunt MA, Marciniuk DD, Brooks D, Chen YW, Hoens AM, Camp PG. Int J Chron Obstruct Pulmon Dis. 2012; 7:297-320. Epub 2012 May 14.