Funding for this research was provided by:
Grants-in-Aid for Scientific Research (JP18K14808, 17H04659, 17H04731)
Grant-in-Aid for Scientific Research on Innovative Areas (JP19H05737)
Received: 21 January 2022
Accepted: 5 March 2022
First Online: 15 March 2022
: This study was approved by the ethical committees of the Nepal Health Research Council (approval no. 142/2016) and the Institution of Tropical Medicine, Nagasaki University (approval no. 150226137-3). Each participant in the study was given detailed information about the research objectives, data collection procedures, benefits, risk, and confidentiality before written informed consent was obtained. If a participant was unable to write, a thumb impression was obtained.
: Not applicable.
: The authors declare that they have no competing interests.