Received: 14 October 2020
Accepted: 16 March 2021
First Online: 23 March 2021
: All study protocols were approved by the ethics review board at our institution (Keio University School of Medicine), and the experiment was conducted according to the Guidelines for Cadaver Dissection in Education and Research of Clinical Medicine. The cadavers of this study were provided by the clinical anatomy laboratory of Keio University. The consent to use the cadavers was obtained from the patient before death.
: Not applicable.
: The authors declare that they have no competing interests.