Chinese Academy of Medical Sciences,Peking Union Medical College Hospital, Beijing, China
Department of Internal Medicine, General Hospital of Argolida, Argos, Greece
4th Department of Internal Medicine, ATTIKON University General Hospital, Athens, Greece
Obstructive Diseases Clinic, Sotiria Athens Hospital of Chest Diseases, Athens, Greece
10th Department of Pulmonary Medicine, Sotiria Athens Hospital of Chest Diseases, Athens, Greece
2nd Department of Internal Medicine, University General Hospital of Alexandroupolis, Alexandroupolis, Greece
1st Department of Internal Medicine, General Hospital of Athens G. GENNIMATAS, Athens, Greece
Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong, China
Cairo University, Giza, Egypt
Glenfield Hospital Leicester, Leicester, Leicestershire, United Kingdom
Gazi University, Ankara, Turkey
Washington University School of Medicine (St. Louis), Saint Louis, Missouri, United States
University of Virginia Cystic Fibrosis Center, Charlottesville, Virginia, United States
University of Minnesota, Minneapolis, Minnesota, United States
Massachusetts General Hospital, Boston, Massachusetts, United States
Mayo Clinic, Rochester, Minnesota, United States