Received: 30 May 2017
Accepted: 3 January 2018
First Online: 18 January 2018
: The Demography and Health Survey (DHS) project sought and obtained the required ethical approvals from ethics committees in Bangladesh, India, Nepal and Pakistan before the surveys were conducted. Informed consent was obtained from study participants before their participation in the surveys. Publicly available, de-identified datasets were used in this study following approval from The DHS Program to download and use the data.
: Not applicable
: The authors declare that they have no competing interests.