Funding for this research was provided by:
Japan Agency for Medical Research and Development
Received: 20 October 2018
Accepted: 14 January 2019
First Online: 29 January 2019
Ethical approval and consent to participate
: We obtained the ethical approval from the Research Ethics Committee of the Graduate School of Medicine, University of Tokyo, Japan (Serial number 11498), and the Department of Medical Research, Myanmar (ERC number 001117). We explained to all pregnant women about the purpose of the study and confidentiality of the data. Their participation was voluntary and we obtained written informed consents at the time of data collection.
: Not applicable.
: The authors declare that they have no competing interest.
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