Funding for this research was provided by:
Ministry of Health, Labour and Welfare (JPMH20FC1025, JP19ek0109276, JP20ek0109482)
Ministry of Education, Culture, Sports, Science, and Technology (JP20K08207)
Received: 6 May 2021
Accepted: 28 November 2021
First Online: 18 December 2021
: This study was approved by the Ethics Committee of Kumamoto University (approval no. 1537). Written informed consent was obtained from the parents or legal guardians of newborns.
: Not applicable.
: The authors declare that they have no competing interests.