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Shimizuguchi et al. Hepatoma Res 2020;6:66 I http://dx.doi.org/10.20517/2394-5079.2020.51 Page 9 of 10

Availability of data and materials
Not applicable.

Financial support and sponsorship
None.

Conflicts of interest
All authors declared that there are no conflicts of interest.

Ethical approval and consent to participate
This study was approved by the Institutional Review Board of Tokyo Metropolitan Cancer and Infectious
Diseases Center, Komagome Hospital (#2450).

Consent for publication
Not applicable.

Copyright
© The Author(s) 2020.

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