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Open-Access Journal
Review
Basic Study
Mitsuru Esaki, Toshiki Horii, Ryoji Ichijima, Masafumi Wada, Seiichiro Sakisaka, Shuichi Abe, Naru Tomoeda, Yusuke Kitagawa, Kei Nishioka, Yosuke Minoda, Shinichi Tsuruta, Sho Suzuki, Hirotada Akiho, Eikichi Ihara, Yoshihiro Ogawa, Takuji Gotoda 
World J Gastrointest Surg 13(2):116-126. Published online Feb 27, 2021. doi: 10.4240/wjgs.v13.i2.116
Retrospective Study
Yosuke Tsuruga, Toshiya Kamiyama, Hirofumi Kamachi, Tatsuya Orimo, Shingo Shimada, Akihisa Nagatsu, Yoh Asahi, Yuzuru Sakamoto, Tatsuhiko Kakisaka, Akinobu Taketomi 
World J Gastrointest Surg 13(2):153-163. Published online Feb 27, 2021. doi: 10.4240/wjgs.v13.i2.153
Retrospective Cohort Study
Observational Study
Tai Ren, Yong-Sheng Li, Xue-Yi Dang, Yang Li, Zi-Yu Shao, Run-Fa Bao, Yi-Jun Shu, Xu-An Wang, Wen-Guang Wu, Xiang-Song Wu, Mao-Lan Li, Hong Cao, Kun-Hua Wang, Hong-Yu Cai, Chong Jin, Hui-Han Jin, Bo Yang, Xiao-Qing Jiang, Jian-Feng Gu, Yun-Fu Cui, Zai-Yang Zhang, Chun-Fu Zhu, Bei Sun, Chao-Liu Dai, Lin-Hui Zheng, Jing-Yu Cao, Zhe-Wei Fei, Chang-Jun Liu, Bing Li, Jun Liu, Ye-Ben Qian, Yi Wang, Ya-Wei Hua, Xi Zhang, Chang Liu, Wan-Yee Lau, Ying-Bin Liu 
World J Gastrointest Surg 13(2):176-186. Published online Feb 27, 2021. doi: 10.4240/wjgs.v13.i2.176
Prospective Study
Systematic Reviews
Scientometrics