Pulmonary Disease, Chronic Obstructive

• Research Site — Jasper, Alabama, United States
• Research Site — Mobile, Alabama, United States
• Research Site — Tucson, Arizona, United States
• Research Site — Fort Smith, Arkansas, United States

• Edward Hines, Jr. VA Hospital — Hines, Illinois, United States

• University Medical Center Hamburg-Eppendorf — Hamburg, Germany

• Respiratory Medicine, Castgle Hill Hospital — Cottingham, East Yorkshire, United Kingdom

• Horizon Clinical Research Associates, PLLC — Gilbert, Arizona, United States
• Pulmonary Associates, PA — Phoenix, Arizona, United States
• UCLA David Geffen School of Medicine — Los Angeles, California, United States
• University Clinical Research - DeLand, LLC — DeLand, Florida, United States

• Division of Pulmonary Diseases; Geneva University Hospital — Geneva, Canton of Geneva, Switzerland

• Dept of Clinical Nutrition, Sahlgrenska Academy at University of Gothenburg — Gothenburg, Sweden

• Department of Pulmonology, Albert Szent-Györgyi Clinical Center, University of Szeged — Deszk, Hungary

Not specified

• University Hospital Ruhrlandklinik — Essen, Nordrheinwestfalen, Germany