1. Bio-Medical Research Centre, Lam Dong Medical College, Da Lat, Vietnam
2. Penn State Medical College, Hershey
Medical Center, PA 117033, USA
3. Pham Ngoc Thach University of Medicine, Ho Chi Minh City, VietNam
4. Internal Medicine Department, Respiratory Unit, Can Tho University of Medicine and Pharmacy, Can Tho, Vietnam
5. Department of Family Medicine, Faculty of Medicine, University of Medicine and Pharmacy, Ho Chi Minh City,
Vietnam
6. Department of Respiratory Functional Exploration. University Medical Center, Ho Chi Minh City, Vietnam
7. Department of Public Health and Primary Care, Leiden University Medical Center, Leiden, The Netherlands