1. Sleep Lab Center, Lam Dong Medical College and Bio-Medical Research Center, Dalat City, Vietnam
2. Immuno-Allergology
and Respiratory Division, Hershey Medical Center, Penn State Medical College, PA, USA
3. Sleep Lab Unit,
Outpatient Department, Pham Ngoc Thach Medical University, Ho Chi Minh City, Vietnam
4. Department of Internal
Medicine, Nam Anh General Hospital, Binh Duong Province, Vietnam
5. Department of Public Health, Thang Long
University. Ha Noi City, Vietnam