Impact of Endoscopic Surgical Skill Qualification on Laparoscopic Resections for Rectal Cancer in Japan: The EnSSURE Study oleh Nobuki Ichikawa, MD, PhD, Shigenori Homma, MD, PhD, Koya Hida, MD, PhD, Tomonori Akagi, MD, PhD, Yasuyuki Kamada, MD, PhD, Tomohiro Yamaguchi, MD, PhD, Masaaki Ito, MD, PhD, Fumio Ishida, MD, PhD, Jun Watanabe, MD, PhD, Daisuke Yamamoto, MD, Hiroaki Iijima, MPH, MSc, Shigeki Yamaguchi, MD, PhD, Masafumi Inomata, MD, PhD, Yoshiharu Sakai, MD, PhD, Takeshi Naitoh, MD, PhD, Akinobu Taketomi, MD, PhD, EnSSURE study group collaboratives in Japan Society of Laparoscopic Colorectal Surgery∥∥