TY - JOUR T1 - Endogenous opioids modify dyspnoea during treadmill exercise in patients with COPD JF - European Respiratory Journal JO - Eur Respir J DO - 10.1183/09031936.00145208 AU - D.A. Mahler AU - J.A. Murray AU - L.A. Waterman AU - J. Ward AU - W.J. Kraemer AU - X. Zhang AU - J.C. Baird Y1 - 2009/02/12 UR - http://erj.ersjournals.com/content/early/2009/02/12/09031936.00145208.abstract N2 - 300 Multiple ChoicesThis is a pdf-only article and there is no markup to show you.full-text.pdf ER -