Funding for this research was provided by:
National Center for Global Health and Medicine (25A-5)
Text and Data Mining valid from 2019-09-11
Received: 9 April 2019
Accepted: 28 August 2019
First Online: 11 September 2019
Ethics approval and consent to participate
: Ethical approval for this study was obtained from the Ethical Review Committee of University of the Ryukyus for Epidemiological Study (No.249, Aug/2014) and the National Ethics Committee for Health Research of Lao PDR (Clearance No. 041/2015). Before starting the survey, trained surveyors explained the details of the study to the participants, such as its purpose, the nature of voluntary participation, information that would be collected, and how the researchers would keep and manage the information. Written informed consent was obtained from each participant.
: Not applicable.
: The authors declare that they have no competing interests.