Funding for this research was provided by:
Thailand Research Fund (550502)
Received: 12 October 2017
Accepted: 14 August 2018
First Online: 23 August 2018
Ethics approval and consent to participate
: This present study was approved by the Khon Kaen University Ethics Committee for Human Research, based on the Declaration of Helsinki and the ICH Good Clinical Practice Guidelines; reference number HE512053. Written informed consent was obtained from all participants.
: Not applicable.
: The authors declare that they have no competing interests.
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