Funding for this research was provided by:
Thammasat University (TP.2-10/2559)
Text and Data Mining valid from 2019-11-11
Received: 15 June 2019
Accepted: 31 October 2019
First Online: 11 November 2019
Compliance with Ethical Standards
: All authors declare that they have no conflict of interest.
: All procedures performed in the present study involving human participants were in accordance with the ethical standards of the Human Research Ethics Committee of Thammasat University No.1 (Faculty of Medicine: MTU-EC-PE-1-191/58) and the 1964 Helsinki Declaration and its later amendments or comparable ethical standards.
: Informed consent was obtained from all individual parents and assent from participants (if possible) included in the study.