Chronic Obstructive Pulmonary Disease Severe

• Lithuanian University of Health Sciences — Kaunas, Kaunas County, Lithuania

• Research Unit, Blekinge University of Technology — Karlskrona, Blekinge County, Sweden
• Department of Heart, Lung and Clinical Physiology, Örebro University Hospital — Örebro, Sweden

• Beijing Chaoyang Hospital Affiliated to Capital Medical University — Beijing, Beijing Municipality, China

• Hospital de Clinicas de Porto Alegre — Porto Alegre, Rio Grande do Sul, Brazil

Not specified

• University of Alabama — Birmingham, Alabama, United States
• University of Arizona — Tucson, Arizona, United States
• University of California, Davis Health — Sacramento, California, United States
• Northwestern — Chicago, Illinois, United States

• Guys and St Thomas NHS Foundation Trust — London, United Kingdom

• Centre hospitalier universitaire de Sherbrooke (CHUS) — Sherbrooke, Quebec, Canada

• Prince of Wales Hospital — Hong Kong, China
• Tai Po Hospital — Hong Kong, China

• Odense University Hospital — Odense, Region Syddanmark, Denmark
• Gesunder Werra-Meißner-Kreis GmbH — Eschwege, Hesse, Germany
• Maccabi Healthcare Services Southern Region — Ashdod, Israel
• Assuta Ashdod Hospital — Ashdod, Israel