Funding for this research was provided by:
Khon Kaen University (IN62334)
Article History
Received: 7 April 2020
Accepted: 16 September 2020
First Online: 21 September 2020
Ethics approval and consent to participate
: The study was approved by the institutional review board of the Khon Kaen University, Human Ethical Committee (#HE591334). Before participants were enrolled in the study, written informed consent was obtained from their parents or guardians.
: The consent to publish identifying images were obtained from the parents.
: The authors declared no conflict of interest.