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Article History

Received: 6 January 2017

Accepted: 23 February 2018

First Online: 27 February 2018

Ethics approval and consent to participate

: This retrospective study was approved by the Ethics Committee of the Osaka Medical College (No. 2034), and the tenets of the Declaration of Helsinki were followed.

: All the patients in all figures gave consent to publish.

: All the authors declare that they have no competing interests.

: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.