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Nakamura et al. Mini-invasive Surg 2019;3:29 I http://dx.doi.org/10.20517/2574-1225.2019.28 Page 5 of 5

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

Ethical approval and consent to participate
Not applicable.

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Copyright
© The Author(s) 2019.

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