Article History
Received: 28 September 2021
Revised: 12 November 2021
Accepted: 20 November 2021
First Online: 25 January 2022
Declarations
: The experimental protocol was approved by the ethical board of the Sapporo-Kosei General Hospital (No. 580) and International University of Health and Welfare (No. 19-Im-007). All research activities complied with all relevant ethical regulations and were performed in accordance with relevant guidelines and regulations in the all hospitals mentioned above. Informed consent to use histopathological samples and pathological diagnostic reports for research purposes had previously been obtained from all patients prior to the surgical procedures at all hospitals, and the opportunity for refusal to participate in research had been guaranteed by an opt-out manner.
: F.K. and M.T. are employees of Medmain Inc. All authors declare no competing interests.