Funding for this research was provided by:
Japan Agency for Medical Research and Development (16ck0106243h0001, 19ck0106475h0001)
Received: 4 November 2020
Accepted: 9 August 2021
First Online: 24 August 2021
: A written letter of consent was prepared after obtaining informed consent from each of the parent to participate in this study. The study protocol was approved by the Ethical Committee of the National Institutes of Biomedical Innovation, Health and Nutrition, Japan (Approval No. 199-03).
: Not applicable.
: The authors declare that they have no competing interests.