Funding for this research was provided by:
Japan Society for the Promotion of Science (15H05302)
Toyota Foundation (D15-R-0447)
Japan International Cooperation Agency
Received: 12 January 2021
Accepted: 24 May 2021
First Online: 9 June 2021
: The research protocol was submitted to and approved by the National Ethics Committee for Health Research in the Ministry of Health in Cambodia (approved number 064NECHR and 139NECHR) and the Ethics Committee at Nagasaki University School of Tropical Medicine and Global Health in Japan (approved number NU-TMGH_045). The objective of this study was informed to the participants within an invitation sent to them as well as before starting the questionnaire. Written informed consent was obtained from each participant.
: Not applicable.
: All the authors declare that they have no competing interests.