Funding for this research was provided by:
Thailand Science Research and Innovation (MRG6280049)
Chiang Mai University (R000023246)
Received: 17 June 2020
Accepted: 15 February 2021
First Online: 19 February 2021
Ethics approval and consent to participate
: Ethical clearance and approval were obtained from the Chiang Mai University Research Ethics Committee with exemption (REC-25620711–17045). The confidentiality of the data and anonymity of the respondents were maintained. Moreover, the respondents gave their informed consent when the purpose of the study was explained and they were assured that their confidentiality would be maintained.
: Not applicable.
: All the authors declare that they have no competing interests.