Funding for this research was provided by:
Received: 22 July 2020
Accepted: 12 January 2021
First Online: 21 January 2021
Ethics approval and consent to participate
: This study used subject-level electronic health related databases that protected the identity of the individuals. MinaCare is allowed to use such anonymized data under the data transfer contract with its client health insurers. Although this study is outside the scope of the guidelines because the data is protected by anonymization, we referred to the “Ethical Guidelines for Epidemiological Research” laid down by the Japanese government [CitationRef removed] .
: Not applicable.
: Chikako Shirai is a full-time employee of Pfizer Japan Inc. Nobushige Matsuoka is a full-time employee of Pfizer R&D Japan G.K. Toru Nakazawa is a Professor of Tohoku University Graduate School of Medicine and has no conflicts of interest associated with this manuscript.