Received: 20 February 2019
Accepted: 29 August 2019
First Online: 14 September 2019
Ethics approval and consent to participate
: Ethical clearance of this study was obtained from the Ethics Committee of the Faculty of Tropical Medicine, Mahidol University, Thailand (application number TMEC 17–078). The objectives, procedures, and potential risk were orally explained to all participants. Written informed consent was given and signed by all participants. Parents/guardians provided consent on behalf of child participants.
: Not applicable.
: The authors declare that they have no competing interests.