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Open-Access Journal
Editorial
Opinion Review
Basic Study
Case Control Study
Retrospective Study
Christopher P Rice, Krishnamurthy B Vaishnavi, Celia Chao, Daniel Jupiter, August B Schaeffer, Whitney R Jenson, Lance W Griffin, William J Mileski 
World J Gastroenterol 25(48):6916-6927. Published online Dec 28, 2019. doi: 10.3748/wjg.v25.i48.6916
Observational Study
Prospective Study
Lucie Benešová, Tereza Hálková, Renata Ptáčková, Anastasiya Semyakina, Kateřina Menclová, Jiří Pudil, Miroslav Ryska, Miroslav Levý, Jaromír Šimša, Filip Pazdírek, Jiří Hoch, Milan Blaha, Marek Minárik 
World J Gastroenterol 25(48):6939-6948. Published online Dec 28, 2019. doi: 10.3748/wjg.v25.i48.6939
Case Report
Shinichi Morita, Kenya Kamimura, Hiroyuki Abe, Yukari Watanabe-Mori, Chiyumi Oda, Takamasa Kobayashi, Yoshihisa Arao, Yusuke Tani, Riuko Ohashi, Yoichi Ajioka, Shuji Terai 
World J Gastroenterol 25(48):6949-6958. Published online Dec 28, 2019. doi: 10.3748/wjg.v25.i48.6949