Acknowledgments
We thank Brian Quinn for his comments and help with the article. This study was supported by Grants-in-Aid for Scientific Research from the Japan Society for the Promotion of Science (JSPS, Nos. 16K11350, 19K09150), research grant from JFE (The Japanese Foundation for Research and Promotion of Endoscopy), research grant from J-CASE (Japanese Consortium of Advanced Surgical Endoscopy), research grant from Kyushu Society of Endoscopic and Robotic Surgery, research grant of Karl Storz Award from Japan Society for Endoscopic Surgery, research grant from The Mother and Child Health Foundation, research grant from the Kawano Masanori Memorial Public Interest Incorporated Foundation for Promotion of Pediatrics, Research Grant from Princess Takamatsu Cancer Research Fund.