Lung Diseases, Obstructive

• National Medical Research Center for Therapy and Preventive Medicine of the Ministry of Healthcare of the Russian Federation — Moscow, Russia
• Centre for Strategic Planning and Management of Biomedical Health Risks of the Federal Medical Biological Agency — Moscow, Russia

• G. F. MacDonald Centre for Lung Health — Edmonton, Alberta, Canada

• Research Site — Denver, Colorado, United States
• Research Site — New Haven, Connecticut, United States
• Research Site — Boston, Massachusetts, United States
• Research Site — Pittsburgh, Pennsylvania, United States

• Klinik Barmelweid — Barmelweid, Switzerland
• Berner Reha Zentrum AG — Heiligenschwendi, Switzerland
• Zürcher RehaZentren Wald — Wald, Switzerland
• Kantonsspital Winterthur — Winterthur, Switzerland

• University of Zurich — Zurich, Switzerland

• National Center of Cardiology and Internal Medicine — Bishkek, Kyrgyzstan

• 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