Funding for this research was provided by:
Faculty of Tropical Medicine, Mahidol University (Post graduate fund)
Received: 18 December 2019
Accepted: 8 May 2020
First Online: 15 May 2020
Ethics approval and consent to participate
: The study protocol was reviewed and ethical clearance was obtained from the Ethics Committee of Faculty of Tropical Medicine, Mahidol University (MUTM 2017-054-01).
: Not applicable.
: The authors declare that they have no competing interests.