Chronic Bronchitis

• University of Pittsburgh Emphysema/COPD Research Center — Pittsburgh, Pennsylvania, United States

• Anhui Chest Hospital — Hefei, Anui, China
• Affiliated Beijing Chaoyang Hospital of Capital Medical University — Beijing, Beijing Municipality, China
• Hospital Emergency General — Beijing, Beijing Municipality, China
• The First People's Hospital of Changzhou — Changzhou, Jiangsu, China

• COPD Foundation — Washington D.C., District of Columbia, United States

Not specified

• China-Japan Friendship Hospital — Beijing, China

• University of Alabama at Birmingham — Birmingham, Alabama, United States
• Mayo Clinic Arizona — Scottsdale, Arizona, United States
• University of California at Los Angeles — Los Angeles, California, United States
• University of California at San Francisco — San Francisco, California, United States

• Peking University First Hospital — Beijing, Beijing Municipality, China
• The Second Affiliated Hospital of Chongqing Medical University — Chongqing, Chongqing Municipality, China
• Xinqiao Hospital, Army Medical University — Chongqing, Chongqing Municipality, China
• First Affiliated Hospital of Guangzhou Medical University — Guangzhou, Guangdong, China

• Karolinska Institutet/Karolinska University Hospital Solna — Stockholm, Sverige, Sweden
• Göteborg University / Sahlgrenska University Hospital — Gothenburg, Sweden
• Linköping Unversity /Linköping University Hospital — Linköping, Sweden
• Lund University / Lund University Hospital — Lund, Sweden

• Karolinska Institutet/Karolinska University Hospital Solna — Stockholm, Sverige, Sweden

• Honor Health — Scottsdale, Arizona, United States
• El Camino Hospital — Mountain View, California, United States
• University of California, Davis Medical Center — Sacramento, California, United States
• Advanced Pulmonary Research Institute — Loxahatchee Groves, Florida, United States