Funding for this research was provided by:
Faculty of Medicine, Chiang Mai University (MED 046/2017)
Received: 4 February 2020
Accepted: 29 July 2020
First Online: 3 August 2020
Ethics approval and consent to participate
: Subjects (or their parents or guardians) have given their written informed consent for their anonymized data to be included in this study.This study was approved by the ethical review board of the Faculty of Medicine, Chiang Mai University (STUDY CODE: MED-2559-043461 Research ID: 4346, Approval number 046/2017).
: Not applicable.
: The authors declare that they have no competing interests