1. Hanoi Medical University, Hanoi 100000, Vietnam
2. Hanoi Obstetrics and Gynecology Hospital, Hanoi 100000, Vietnam
3. Brigham and Women’s Hospital, Boston, MA 02115, USA
4. Vietnam National University, Hanoi 100000, Vietnam
5. Institute for Preventive Medicine and Public Health, Hanoi Medical University, Hanoi 100000, Vietnam