RT Journal Article SR Electronic T1 The case for inspiratory muscle training in COPD JF European Respiratory Journal JO Eur Respir J FD European Respiratory Society SP 233 OP 235 DO 10.1183/09031936.00131210 VO 37 IS 2 A1 N. Ambrosino YR 2011 UL http://erj.ersjournals.com/content/37/2/233.abstract AB