Funding for this research was provided by:
National Research Council of Thailand (92/2550)
Received: 7 December 2016
Accepted: 24 January 2018
First Online: 13 February 2018
Ethics approval and consent to participate
: The ethics of this study were approved by the Siriraj Institutional Review Board Certificate of Approval. This program is completed to certify that the Siriraj Institutional Review Board is in full compliance with international guidelines for human research protection such as the Declaration of Helsinki, the Belmont Report, CIOMS Guidelines and the International Conference on Harmonization in Good Clinical Practice (ICH-GCP). Written informed consent was obtained from both the participants and legal guardians.
: Not applicable.
: The authors declare that they have no competing interests.
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