Received: 5 June 2019
Accepted: 23 September 2019
First Online: 16 October 2019
Ethics approval and consent to participate
: Written informed consent and assent forms to participate in the study were obtained from all participating subjects including children, their parents or legal guardians before enrolling in this study. This clinical study was approved by the Institutional Review Board, Royal Thai Army Medical Department (reference number: R012h/60) according to the ethical principles of the Declaration of Helsinki (1975) including its revision.
: Not applicable.
: The authors declare that they have no competing interests.