Funding for this research was provided by:
Japan Society for the Promotion of Science (19K18637, 15H02660)
Received: 21 June 2019
Accepted: 16 September 2019
First Online: 22 October 2019
Ethics approval and consent to participate
: Ethics approval was obtained from the Institutional Review Board of Nagoya University (approval number: 2015–0415). Participants did not provide written informed consent for inclusion in the study since all data were anonymized and this was a retrospective study, in accordance to the ethical guidelines by the Japanese Ministry of Health, Labor and Welfare. The patients didn’t consent to analysis of their medical records and any further permission from the hospital was not required, however we informed patients about the study on the website of the hospital and there was an option for patients to opt out from their medical records being used in research.
: Not applicable.
: The authors declare that they have no competing interests.