1. Department of Neurosurgery, Viet Duc University Hospital, Hanoi, Vietnam
2. Department of Population and Quantitative Health Sciences, University of Massachusetts Chan Medical School, Worcester, MA, USA
3. Department of Epidemiology, School of Public Health and Preventive Medicine, Hanoi Medical University, Hanoi, Vietnam
4. Department of Internal Medicine, Hanoi Medical University, Hanoi, Vietnam
5. Health Strategy and Policy Institute, Ministry of Health, Hanoi, Vietnam
6. Department of Surgery, Hanoi Medical University, Hanoi, Vietnam
7. Department of Cardiovascular and Thoracic Surgery, Viet Duc University Hospital, Hanoi, Vietnam