Funding for this research was provided by:
ministry of education, culture, sports, science and technology in japan (Grant Number 19H03582, Grant Number 21K17268)
AMED Birthday Grant (JP20gk0110093)
HUSM Grant-in-aid (101337)
Collaborative Research Network for Asian Children with Developmental Disorders (Not applicable)
Received: 3 March 2021
Accepted: 11 August 2021
First Online: 24 September 2021
: The study procedures were approved by the Hamamatsu University School of Medicine and the University Hospital Ethics Committee (approval number: 17-037, 19-145 and 20-233). Written informed consent was obtained from each caregiver for his/her infant’s participation. The study was performed following the Helsinki declaration.
: Not applicable
: The authors have declared that no competing interests exist.