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difficulty while maintaining less invasiveness.

DECLARATIONS
Author’s contributions
Design, manuscript writing: Shigeta K, Ishida T
Literature research, data analysis: Ishida T
Manuscript editing: Okabayashi K, Tsuruta M, Hasegawa H, Kitagawa Y

Availability of data and materials
Not applicable.

Financial support and sponsorship
None.

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

Ethical approval and consent to participate
Not applicable.

Consent for publication
Not applicable.

Copyright
© The Author(s) 2018.

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