Funding for this research was provided by:
National Health and Medical Research Council
Australian Research Council (DP0986594)
Finkel Family Foundation
Received: 3 March 2020
Accepted: 5 June 2020
First Online: 26 June 2020
Ethical approval and consent to participate
: The 2006 Study was approved by the University of Melbourne’s Human Research Ethics Committee (HREC No. 050793), and the Vietnam Medical Association’s Scientific Committee (107/THYH). The 2010 Study was approved by the University of Melbourne’s Health Sciences Human Ethics Committee (Ethics ID 0932624), the Vietnam Medical Association Ethics and Scientific Committee, and the Ha Nam Provincial Health Department Ethics Committee. Ethics approval for this study was obtained from Monash University’s Human Research Ethics Committee (Project ID 19406).
: Not applicable.
: Dr. Thach Tran is an Associate Editor of BMC Public Health. The authors declare that there are no other competing interests.