Funding for this research was provided by:
Invitation Research Grant from the Faculty of Medicine, Khon Kaen University (IN60210)
Text and Data Mining valid from 2020-01-29
Received: 7 October 2019
Accepted: 21 January 2020
First Online: 29 January 2020
Ethics approval and consent to participate
: This study was approved by Khon Kaen University Ethics Committee for Human Research (HE591505). All participants provide written consent before enrollment.
: Not applicable
: The authors declare that they have no competing interests.