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. 2021 Nov 18;8:767110. doi: 10.3389/fmed.2021.767110

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Copyright © 2021 Fujita, Kashihara, Kanai, Hata, Yasoda, Odagaki and Mio.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Duration of the hospitalization. Orange and gray box plots show the mean duration of hospitalization in patients aged < 80 years and those aged ≥ 80 years, respectively.