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Open-Access Journal
Review
Basic Study
Ilias Gountas, Vana Sypsa, George Papatheodoridis, Kyriakos Souliotis, Kostas Athanasakis, Homie Razavi, Angelos Hatzakis 
World J Gastroenterol 25(11):1327-1340. Published online Mar 21, 2019. doi: 10.3748/wjg.v25.i11.1327
Case Control Study
Tarek Besheer, Hatem Elalfy, Mohamed Abd El-Maksoud, Ahmed Abd El-Razek, Saher Taman, Khaled Zalata, Wagdy Elkashef, Hossam Zaghloul, Heba Elshahawy, Doaa Raafat, Wafaa Elemshaty, Eman Elsayed, Abdel-Hady El-Gilany, Mahmoud El-Bendary 
World J Gastroenterol 25(11):1366-1377. Published online Mar 21, 2019. doi: 10.3748/wjg.v25.i11.1366
Retrospective Study
Arata Sakai, Masahiro Tsujimae, Atsuhiro Masuda, Takao Iemoto, Shigeto Ashina, Kohei Yamakawa, Takeshi Tanaka, Shunta Tanaka, Yasutaka Yamada, Ryota Nakano, Yu Sato, Manabu Kurosawa, Takuya Ikegawa, Seiji Fujigaki, Takashi Kobayashi, Hideyuki Shiomi, Yoshifumi Arisaka, Tomoo Itoh, Yuzo Kodama 
World J Gastroenterol 25(11):1387-1397. Published online Mar 21, 2019. doi: 10.3748/wjg.v25.i11.1387
Observational Study
Ana Florencia Costa, Emilia Sugai, María de la Paz Temprano, Sonia Isabel Niveloni, Horacio Vázquez, María Laura Moreno, M. Remedios Domínguez-Flores, Alba Muñoz-Suano, Edgardo Smecuol, Juan Pablo Stefanolo, Andrea F González, Angel Cebolla-Ramirez, Eduardo Mauriño, Elena F Verdú, Julio César Bai 
World J Gastroenterol 25(11):1409-1420. Published online Mar 21, 2019. doi: 10.3748/wjg.v25.i11.1409
Randomized Clinical Trial