Funding for this research was provided by:
Japan Agency for Medical Research and Development (JP17lm0203004j0001)
Japan Society for the Promotion of Science (17J00880, 16H03174)
Received: 5 October 2018
Accepted: 20 November 2018
First Online: 22 January 2019
Ethics approval and consent to participate
: For the experimental use of fresh non-frozen human cadavers, written informed consent was obtained from each donor according to the ethical guidelines of Keio University School of Medicine (approval number: 20070026 and 20150385).
: Not applicable
: The authors declare that they have no competing interests.
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