Tananuvat, Napaporn
Khumchoo, Natawan
Funding for this research was provided by:
The Faculty of Medicine Endowment Fund, Faculty of Medicine, Chiang Mai University (Grant Number: 120/2559)
Article History
Received: 9 January 2020
Accepted: 11 March 2020
First Online: 28 April 2020
Ethics approval and consent to participate
: This study was approved from the Research and Ethics Committee of Faculty of Medicine, Chiang Mai University (Study code: OPT-2559-03823) and followed the tenets of Declaration of Helsinki. Written informed consent was obtained from all the participants and from a parent or guardian for participants under 16 years old after complete explanation.
: Not applicable.
: The authors have declared that no competing interests exist.