PT - JOURNAL ARTICLE AU - D. Hsia AU - R. Casaburi AU - A. Pradhan AU - E. Torres AU - J. Porszasz TI - Physiologic Responses to Linear Treadmill and Cycle Ergometer Exercise in COPD AID - 10.1183/09031936.00069408 DP - 2009 Mar 12 TA - European Respiratory Journal 4099 - http://erj.ersjournals.com/content/early/2009/03/12/09031936.00069408.short 4100 - http://erj.ersjournals.com/content/early/2009/03/12/09031936.00069408.full