Accepted: 7 January 2021
First Online: 13 January 2021
Ethics approval and consent to participate
: The study protocol was approved by the “Office of The Committee for Research Ethics (Social Sciences), Mahidol University (No.: 2017/055.1403)”, and study permission was obtained from the study sites. Written informed consent was obtained from participants.
: Not applicable.
: The authors declare that they have no competing interests.