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.
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