Text and Data Mining valid from 2017-09-02
Received: 23 May 2016
Accepted: 28 August 2017
First Online: 2 September 2017
Ethics approval and consent to participate
: The Medical Ethics Committee of Nara Medical University approved this retrospective study, and it was exempted from obtaining informed consent from the patients in consideration of the aim and methods of the study.Reference number: NMU-594-2.
: No personal data are involved.
: Makito Miyake is a member of the editorial board (Deputy Section Editor) of this journal.All other authors declare no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.