Document is current

Article History

Received: 12 November 2018

Accepted: 21 November 2018

First Online: 14 December 2018

Ethics approval and consent to participate

: This study was approved by the Ethics Committee of Osaka General Medical Center. All participants consented prior to enrolment.

: Not applicable.

: The authors declare that they have no competing interests.

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