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Open-Access Journal
Review
Ross King, Conall Hayes, Claire L Donohoe, Margaret R Dunne, Maria Davern, Noel E Donlon 
World J Gastrointest Oncol 13(5):312-331. Published online May 15, 2021. doi: 10.4251/wjgo.v13.i5.312
Gianluca Rompianesi, Marcello Di Martino, Alex Gordon-Weeks, Roberto Montalti, Roberto Troisi 
World J Gastrointest Oncol 13(5):332-350. Published online May 15, 2021. doi: 10.4251/wjgo.v13.i5.332
Minireviews
Ming-Cheng Guan, Wei Ouyang, Ming-Da Wang, Lei Liang, Na Li, Ting-Ting Fu, Feng Shen, Wan-Yee Lau, Qiu-Ran Xu, Dong-Sheng Huang, Hong Zhu, Tian Yang 
World J Gastrointest Oncol 13(5):351-365. Published online May 15, 2021. doi: 10.4251/wjgo.v13.i5.351
Chen Li, Quan Wang, Ke-Wei Jiang 
World J Gastrointest Oncol 13(5):391-399. Published online May 15, 2021. doi: 10.4251/wjgo.v13.i5.391
Hannah McCaughan, Stephen Boyle, John J McGoran 
World J Gastrointest Oncol 13(5):400-408. Published online May 15, 2021. doi: 10.4251/wjgo.v13.i5.400
Mustafa Erdem Arslan, Hua Li, Zhiyan Fu, Timothy A Jennings, Hwajeong Lee 
World J Gastrointest Oncol 13(5):409-423. Published online May 15, 2021. doi: 10.4251/wjgo.v13.i5.409
Retrospective Study
Omar Elshaarawy, Aya Aman, Hazem Mohamed Zakaria, Talaat Zakareya, Asmaa Gomaa, Esam Elshimi, Eman Abdelsameea 
World J Gastrointest Oncol 13(5):424-439. Published online May 15, 2021. doi: 10.4251/wjgo.v13.i5.424
Observational Study
Mohammad Elsayed, Mohammad Loya, James Galt, David M Schuster, Zachary L Bercu, Janice Newsome, David Brandon, Sonia Benenati, Keywan Behbahani, Richard Duszak, Ila Sethi, Nima Kokabi 
World J Gastrointest Oncol 13(5):440-452. Published online May 15, 2021. doi: 10.4251/wjgo.v13.i5.440
Systematic Reviews
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