COPD Exacerbation

• Barnsley Hospital NHS Foundation Trust — Barnsley, United Kingdom
• University Hospitals Birminham NHS Foundation Trust — Birmingham, United Kingdom
• Blackpool Teaching Hospitals — Blackpool, United Kingdom
• Bradford Teaching Hospitals NHS Foundation Trust — Bradford, United Kingdom

• Rijnstate Hospital — Arnhem, Netherlands
• Albert Schweizer ziekenhuis — Dordrecht, Netherlands
• University Medical Center Groningen — Groningen, Netherlands

• Faculty of Medicine, Assiut University — Asyut, Egypt

• Research site — Copenhagen, Denmark
• Research site — Leicester, United Kingdom

• MGH Institute of Health Professions — Charlestown, Massachusetts, United States

• Groupe Hospitalier Pitié Salpêtrière-Charles Foix — Paris, Île-de-France Region, France

• Centre hospitalier de Versailles — Le Chesnay, France
• CH Le Mans — Le Mans, France

• University of Tennessee Medical Center — Knoxville, Tennessee, United States

Not specified

Not specified