Funding for this research was provided by:
Ministry of Health, Labour and Welfare (H29-Shinko-Shitei-003, 20HA2001)
Received: 27 November 2019
Accepted: 15 September 2020
First Online: 29 September 2020
Ethics approval and consent to participate
: This study was approved by the Institutional Review Board associated with Saga University (No. 30–33), which conformed to the ethical guidelines of the Helsinki Declaration. Written informed consent was obtained for the guardians of all participants.
: Not applicable since there are no details, images, or videos relating to an individual person.
: Megumi Hare received lecture fees from GlaxoSmithKline/JapanVaccine, Merck Sharp and Dohme, and Sanofi Pasteur Inc. All other authors have no conflicts of interest relevant to this article to disclose.