Funding for this research was provided by:
Japan Society for the Promotion of Science (18K07120, 18K07121)
Japan Agency for Medical Research and Development (19fk0108061h0302)
Asahi Group Holdings (AM227CH501)
Juntendo University (6119002)
Received: 15 January 2020
Accepted: 8 April 2020
First Online: 16 April 2020
Ethics approval and consent to participate
: The study protocol was approved by the ethics committee of Juntendo University (number 809), and by the Biosafety Committee, Juntendo University (approval number BSL2/29–1). Individual informed consent was waived by the ethics committee listed above because this study used currently existing sample collected during the course of routine medical care and did not pose any additional risks to the patients. Informed consent about study participation was officially announced by mail and poster. All patient data were anonymized prior to the analysis.
: Not applicable.
: The authors declare that they have no competing interests.