1. Division of Epidemiology Department of Medicine Vanderbilt Epidemiology Center Vanderbilt‐Ingram Cancer Center Vanderbilt University School of Medicine Nashville Tennessee USA
2. National Cancer Hospital Vietnam National Cancer Institute Hanoi Vietnam
3. Hanoi Medical University Hanoi Vietnam
4. Hanoi Oncology Hospital Hanoi Vietnam
5. UPMC Hillman Cancer Center University of Pittsburgh Medical Center Pittsburgh Pennsylvania USA
6. Department of Epidemiology Graduate School of Public Health University of Pittsburgh Pittsburgh Pennsylvania USA
7. Ministry of Health Hanoi Vietnam