Lung Diseases, Obstructive

• Anhui Medical University - Hefei First People's Hospital — Hefei, Anhui, China
• Peking University Third Hospital — Beijing, Beijing Municipality, China
• Beijing Hospital — Beijing, Beijing Municipality, China
• The Third Affiliated Hospital Of Guangzhou Medical University — Guangzhou, Guangdong, China

• Guangzhou Institute of Respiratory Diseases, the First Affiliated Hospital of Guangzhou Medical University — Guangzhou, Guangdong, China

Not specified

• SGS Belgium NV - Clinical Pharmacology Unit — Edegem, Antwerpen, Belgium

• ICS Maugeri IRCCS, Respiratory Rehabilitation of the Institute of Lumezzane — Lumezzane, Brescia, Italy

• Shanghai Xuhui Central Hospital — Shanghai, Shanghai Municipality, China

• University Hospital "St George" — Plovdiv, Bulgaria

• University of Rzeszów — Rzeszów, Poland

• China Japan Friendship Hospital — Beijing, Beijing Municipality, China

• Sohag University Hospital — Sohag, Egypt