Portable Oxygen Concentrator Improvements to Physical Activity, Oxygen Usage, and Quality of Life in Chronic Obstructive Pulmonary Disease Patients Using Long-term Oxygen Therapy (POC-STEP)

UPMC Emphysema/COPD Research Center, Pittsburgh

Kentucky Research Group, Louisville

St. Vincent Airways, Indianapolis

ClinSite LLC, Ann Arbor

University of Iowa, Iowa City

Minnesota Lung Center, Woodbury

Minnesota Lung Center, Minneapolis

Minnesota Lung Center, Edina

University of Illinois, Chicago, Chicago

National Jewish Health, Denver

Sierra Clinical Research, Las Vegas