Received: 15 October 2020
Accepted: 23 April 2021
First Online: 5 May 2021
: The study was conducted with the approval of the institutional review board (IRB) of Tokyo Neurological Center and Matsui Hospital. All participants signed written consent to participate in the study. Written informed consent was obtained from a parent or guardian for participants under 16 years old. All rights of the patients were protected against any kind of disadvantage and individual matters.
: Not applicable. We are permitted to reproduce copyrighted materials.
: The authors declare no competing interests.