COPD Exacerbation

• Peking University First Hospital — Beijing, Beijing Municipality, China
• Aerospace 731 Hospital — Beijing, Beijing Municipality, China
• Beijing Changping Hospital — Beijing, Beijing Municipality, China
• Beijing Jingmei Group General Hospital — Beijing, Beijing Municipality, China

• Northwell Health — Manhasset, New York, United States

• Denizli Public Hospitals Association, Buldan Chest Diseases Hospital — Denizli, Turkey (Türkiye)

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

• the Second Hospital Zhejiang University School of Medicine — Hangzhou, Zhejiang, China

Not specified

• University Medical Center; Department of Pulmonary Diseases — Groningen, Netherlands

• Folktandvarden Skane — Malmö, Sweden
• Orebro Specialisttandvard — Örebro, Sweden

• Far Eastern Memorial Hospital — New Taipei City, Taiwan

• Department of Respiratory Diseases and Allergy — Aarhus N, Denmark