Cough

• Hospital Universitario Hermanos Trias y Pujol — Badalona, Barcelona, Spain
• Hospital Univesitario de Bellvitge — L'Hospitalet de Llobregat, Barcelona, Spain
• Parc Taulí Hospital Universitari — Sabadell, Barcelona, Spain
• Hospital del Mar — Barcelona, Spain

• University of California San Diego — San Deigo, California, United States

• Faculty of Medicine, Al-Azhar university Assiut, Egypt. — Asyut, Egypt

• Muğla Training and Research Hospital — Muğla, Menteşe, Turkey (Türkiye)

• King's College Hospital — London, United Kingdom

• St. Joseph's Healthcare Hamilton — Hamilton, Ontario, Canada
• West Park Healthcare Centre — Toronto, Ontario, Canada

• Kingston Health Sciences Centre — Kingston, Ontario, Canada

• Weill Cornell Medicine — New York, United States

Not specified

• Respiratory Clinical Trials Centre, University of Calgary — Calgary, Alberta, Canada
• Respiratory Research Lab, McMaster University — Hamilton, Ontario, Canada
• St Joseph's Health Care London — London, Ontario, Canada
• Institut universitaire de cardiologie et de pneumologie de Quebec - University Laval — Québec, Quebec, Canada