Funding for this research was provided by:
Faculty of Medicine, Chiang Mai University (Grant no.059/2562)
Article History
Received: 7 November 2019
Accepted: 22 April 2020
First Online: 30 April 2020
Compliance with ethical standards
: The study was reviewed and approved by the Human Ethical Committee at Faculty of Medicine, Chiang Mai University (No. 014/2562), before we began data collection.
: The authors declare that they have no competing interests.