Funding for this research was provided by:
Pfizer Japan Inc.
Article History
Received: 1 August 2023
Accepted: 19 September 2023
First Online: 16 October 2023
Declarations
:
: Naoko Izumi was involved in research and preparation of the manuscript as an employee of Pfizer Japan Inc. Takeya Kitta and Takahiko Mitsui did not receive any compensation related to this study, from Pfizer. We thank the children who were included in the study anonymously.
: This study did not require institutional review board or independent ethics committee approval because the guidelines do not require such approval for information that has already been anonymized. Patient consent was waived since the guidelines do not require consent for anonymized information.