Text and Data Mining valid from 2019-03-21
Received: 12 June 2018
Accepted: 12 December 2018
First Online: 21 March 2019
Ethics approval and consent to participate
: The study was performed in accordance with the Declaration of Helsinki and approved by the institutional ethical board of Kyoto Chubu Medical Center.
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: The authors declare that they have no competing interests.
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