Funding for this research was provided by:
Received: 23 November 2022
Accepted: 11 April 2023
First Online: 28 April 2023
: This study was approved by the Institutional Review Board of Kyushu University, Japan (approval/29067), and the National Ethics Committee for Health Research, Ministry of Health, Cambodia (approval/289NECHR). The participants joined voluntarily and written informed consent was obtained from all caregivers.
: Not required.
: The authors declare that they have no competing interests.