Funding for this research was provided by:
Japan Society for the Promotion of Science (16K14572, 17H03555)
Received: 11 February 2019
Accepted: 22 March 2019
First Online: 6 May 2019
Ethics approval and consent to participate
: Written consent for autopsy and subsequent use of autopsied samples for research was obtained from the next of kin of each patient. The ethics committee of Tokyo Metropolitan Institute of Medical Science approved this study. (#16–25).
: The authors declare that they have no interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.