Acute Exacerbation of COPD

• Reinier de Graaf — Delft, Netherlands
• Franciscus Gasthuis & Vlietland — Rotterdam, Netherlands
• Ikazia — Rotterdam, Netherlands
• Haaglanden Medisch Centrum — The Hague, Netherlands

• Intensive care department-Hospital Tenon — Paris, France

• Ziekenhuis Oost-Limburg — Genk, Belgium

• Henan Provincial People's Hospital — Zhengzhou, Henan, China
• The Second Xiangya Hospital of Central South University — Changsha, Hunan, China
• Sir Run Run Shaw Hospital, School of Medicine, Zhejiang University — Hangzhou, Zhejiang, China
• Taizhou Hospital of Integrated Traditional Chinese and Western Medicine — Wenling, Zhejiang, China

• CDA Hospital Islamabad — Islamabad, Pakistan

Not specified

• Queen Mary Hospital — Hong Kong

• Ziekenhuis Oost-Limburg — Genk, Limburg, Belgium

• Peking University Third Hospita — Beijing, Beijing Municipality, China

• University of Chicago — Chicago, Illinois, United States