Funding for this research was provided by:
Kawasaki Medical School (23-K17)
Japan Society for the Promotion of Science (JP25460425)
Received: 6 June 2018
Accepted: 13 December 2018
First Online: 16 January 2019
Ethics approval and consent to participate
: Written informed consent was obtained for use of retrospective tissue samples from the patients within this study. Ethnical approval was obtained from Institutional Review Board of Kawasaki Medical School ethics committee (approval number 909 and 2136).
: Not applicable.
: The authors declare that they have no competing interests.
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