Funding for this research was provided by:
Thailand Research Fund
Received: 20 August 2018
Accepted: 20 May 2019
First Online: 27 May 2019
Ethics approval and consent to participate
: WHO Global Survey on Maternal and Perinatal Health (WHOGS, 2004–08) was approved by the research ethics review committee of World Health Organization and the relevant ethical clearance mechanisms in all countries. We received permission to use the data of this study from the Department of Reproductive Health and Research, WHO on the date January 14, 2014.
: Not applicable.
: The authors declare that they have no competing interests.