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Open-Access Journal
Editorial
Review
Basic Study
Retrospective Cohort Study
Seak Hee Oh, Soo-Hee Chang, Hyun Jin Kim, Jin Min Cho, Ji-Hee Hwang, Jung-Man Namgoong, Dae Yeon Kim, Young-Ah Cho, Chong Hyun Yoon, Kyung Mo Kim 
World J Gastroenterol 21(20):6229-6235. Published online May 28, 2015. doi: 10.3748/wjg.v21.i20.6229
Retrospective Study
Kieron BL Lim, Hamid R Sima, M Isabel Fiel, Viktoriya Khaitova, John T Doucette, Maria Chernyiak, Jawad Ahmad, Nancy Bach, Charissa Chang, Priya Grewal, Leona Kim-Schluger, Lawrence Liu, Joseph Odin, Ponni Perumalswami, Sander S Florman, Thomas D Schiano 
World J Gastroenterol 21(20):6236-6245. Published online May 28, 2015. doi: 10.3748/wjg.v21.i20.6236
Minoru Tomizawa, Fuminobu Shinozaki, Rumiko Hasegawa, Yoshinori Shirai, Yasufumi Motoyoshi, Takao Sugiyama, Shigenori Yamamoto, Naoki Ishige 
World J Gastroenterol 21(20):6246-6251. Published online May 28, 2015. doi: 10.3748/wjg.v21.i20.6246
Observational Study
Randomized Controlled Trial
Systematic Reviews
Meta-Analysis
Case Report
Guilherme Lopes P Martins, Joao Paulo G Bernardes, Marcello S Rovella, Raphael G Andrade, Publio Cesar C Viana, Paulo Herman, Giovanni Guido Cerri, Marcos Roberto Menezes 
World J Gastroenterol 21(20):6391-6397. Published online May 28, 2015. doi: 10.3748/wjg.v21.i20.6391
Su-Sin Jin, Hyeong-Seok Jeong, Hyun-Jin Noh, Woo-Hyung Choi, Seung-Hwa Choi, Kang-Yeon Won, Dong-Pil Kim, Ji-Chan Park, Mi-Kyong Joung, Jeong-Goo Kim, Hae-Joung Sul, Seung-Woo Lee 
World J Gastroenterol 21(20):6404-6408. Published online May 28, 2015. doi: 10.3748/wjg.v21.i20.6404