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Authors
Banno, Aya http://orcid.org/0000-0001-8279-0429
Hifumi, Toru
Okamoto, Hiroshi
Masaki, Minori
Seki, Koichiro
Isokawa, Shutaro
Otani, Norio
Hayashi, Kuniyoshi
Ishimatsu, Shinichi
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Article History
Received: 5 August 2020
Accepted: 25 January 2021
First Online: 9 February 2021
Ethics approval and consent to participate
: The institutional review board approved this study (approval number 20-R057) and waived the requirement for informed consent in view of the retrospective study design and the urgent need for research insights into this growing pandemic.
: Not applicable.
: The authors declare that they have no competing interests.
