Lung Diseases, Obstructive

• Research Site — Birmingham, Alabama, United States
• Research Site — Tucson, Arizona, United States
• Research Site — Little Rock, Arkansas, United States
• Research Site — Bakersfield, California, United States

Not specified

• Jefferson County — Louisville, Kentucky, United States

• Key Laboratory of Respiratory Disease of Zhejiang Province, Department of Respiratory and Critical Care Medicine, Second Affiliated Hospital of Zhejiang University School of Medicine — Hangzhou, Zhejiang, China

• Research Site — Scottsboro, Alabama, United States
• Research Site — Glendale, Arizona, United States
• Research Site — Phoenix, Arizona, United States
• Research Site — Bakersfield, California, United States

• Newcastle Upon Tyne Hospitals NHS Foundation Trust — Newcastle upon Tyne, Tyne and Wear, United Kingdom
• Northumbria Healthcare NHS Foundation Trust — Cramlington, United Kingdom

• Universidad Católica de Ávila — Ávila, Spain

• Hacettepe University Faculty of Health Sciences Department of Physiotherapy and Rehabilitation — Ankara, Please Choose A State, Turkey (Türkiye)

• Department of Anesthesiology, Center of Anesthesiology and Intensive Care Medicine, University Medical Center Hamburg-Eppendorf — Hamburg, Germany

• Fondazione Policlinico Universitario A. Gemelli IRCCS — Roma, Italy