Received: 1 August 2020
Accepted: 12 November 2020
First Online: 19 November 2020
Ethics approval and consent to participate
: The study protocol was approved by the Institutional Review Board of the Kitakyushu Municipal Medical Center (No. 201901076). The requirement for written informed consent was waived because this was an ex vivo porcine model study; all trainees were orally informed about the study and consented to their participation.
: Not applicable.
: The datasets used and analyzed during the current study are available from the corresponding author on reasonable request.
: Ryoji Ichijima, Mitsuru Esaki, Sho Suzuki, Chika Kusano, Hisatomo Ikehara, Takuji Gotoda received a lecture’s fee from Fujifilm. Other authors had no conflict of interest.