Received: 25 March 2020
Accepted: 27 July 2020
First Online: 3 August 2020
Ethics approval and consent to participate
: The study design was approved by the local medical ethics committee of Kanagawa children’s medical center (Yokohama, Japan), and both parents provided written informed consent.
: Written informed consent for publication of the clinical details was obtained from their patents.
: The authors declare that there have no competing interests.