Funding for this research was provided by:
Faculty of Tropical Medicine, Mahidol University
Received: 17 August 2018
Accepted: 12 September 2019
First Online: 26 October 2019
Ethics approval and consent to participate
: The research was approved by the ethics committee of the Faculty of Tropical Medicine, Mahidol University.
: Not Applicable.
: The authors declare that they have no competing interests.