Text and Data Mining valid from 2018-08-22
Received: 25 April 2018
Accepted: 9 August 2018
First Online: 22 August 2018
Ethics approval and consent to participate
: The study was approved by the Institutional Review Board in Niigata Medical Center. Appropriate consents, permissions and releases were obtained.
: All presentations had consent to publish.
: The authors did not receive and will not receive any benefits or funding from any commercial party related directly or indirectly to the subject of this article.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.