Lung Diseases, Obstructive

• VA Bedford HealthCare System, Bedford, MA — Bedford, Massachusetts, United States
• VA Boston Healthcare System Jamaica Plain Campus, Jamaica Plain, MA — Boston, Massachusetts, United States

Not specified

• Theramed Healthcare and Transylvania University — Brasov, Romania
• University Carol Davila and Componenta de Pediatrie - Institutul Național pentru Sănătatea Mamei și Copilului "Alessandrescu-Rusescu" București (INSMC) — Bucharest, Romania
• Spitalul Judetean De Urgenta — Suceava, Romania
• Pediatric Pulmonology Clinic, County Hospital, Victor Babes University of Medicine — Timișoara, Romania

• Yale University — New Haven, Connecticut, United States
• Brigham and Womens Hospital — Boston, Massachusetts, United States
• Washington University — St Louis, Missouri, United States
• Duke University — Durham, North Carolina, United States

• Bozhou People's Hospital — Bozhou, Anhui, China
• Chizhou People's Hospital — Chizhou, Anhui, China
• Chaohu Hospital of Anhui Medical University — Hefei, Anhui, China
• The First Affiliated Hospital of Chongqing Medical University — Chongqing, Chongqing Municipality, China

Not specified

• The First Affiliated Hospital of Sun Yat-sen University — Guangzhou, Guangdong, China
• The Third Affiliated Hospital of Sun Yat-sen University — Guangzhou, Guangdong, China
• The Affiliated Hospital of Qingdao University — Qingdao, Shandong, China
• The Second Affiliated Hospital of Shandong First Medical University — Tai’an, Shandong, China

• Pitié Salpêtrière Hospital - Department of pneumology — Paris, France

Not specified

• The First Affiliated Hospital of Guangzhou Medical University — Guangzhou, China
• Shanghai General Hospital — Shanghai, China