Funding for this research was provided by:
Ministry of Education, Culture, Sports, Science and Technology (MEXT, 20590718)
Received: 6 May 2020
Accepted: 26 October 2020
First Online: 20 November 2020
Ethics approval and consent to participate
: The study protocol was approved by the ethics committee of Hamamatsu University School of Medicine, Hamamatsu, Japan (Approval no. E18–185). The ethics committee of Hamamatsu University School of Medicine determined that informed consent was not required, and was accordingly waived. The opt-out method for used for the use of patient clinical information and tissue samples.
: Not applicable.
: The authors declare no competing interests.