Funding for this research was provided by:
Teijin Pharma Limited
Received: 15 February 2021
Accepted: 21 April 2021
First Online: 3 July 2021
: All patients or their legal guardians received adequate information using an informed consent form, and written informed consent was obtained from all legal guardians of the patients before enrollment. This study was approved by the institutional review boards of all participating institutions (number CB13–49).
: Not applicable.
: The authors declare no competing interests.