Funding for this research was provided by:
the Nakatani Foundation for advancement of measuring technologies in biomedical engineering
a Grant-in-Aid for Scientific Research (B) from the Ministry of Education, Culture, Sports, Science and Technology of Japan (20H03908 and 16K09930)
a Grant-in-aid for Scientific Research from the Japan Society for the Promo-tion of Science (18K07670)
Received: 28 April 2021
Accepted: 6 September 2021
First Online: 23 September 2021
: This study was approved by The Research Ethics Committee of University of Fukui (No. 20100064), and written, informed consent was obtained from the family of each deceased patient prior to autopsy for publication of the research and any accompanying images. A copy of the written consent is available for review by the Editor of this journal. This research conformed to the provisions of the Declaration of Helsinki. The datasets generated and/or analyzed during the current study are not publicly available.
: Consent for publications was obtained from the family of each deceased patient prior to autopsy for publication of the research and any accompanying images.
: The authors declare that they have no conflict of interest.