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Article History

Received: 19 December 2018

Accepted: 8 August 2019

First Online: 22 August 2019

Compliance with ethical standards

:

: Yuichi Yasunaga, Kazunori Yanagawa and Sumio Kawata declare that they have no conflict of interest.

: All procedures followed have been performed in accordance with the ethical standards laid down in the 1964 Declaration of Helsinki and its later amendments.

: Informed consent was obtained from the patient for being included in the article.