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Open-Access Journal
Editorial
Chris JJ Mulder, Geert JA Wanten, Carol E Semrad, Palle B Jeppesen, Hinke M Kruizenga, Nicolette J Wierdsma, Matthijs E Grasman, Adriaan A van Bodegraven 
World J Gastroenterol 22(5):1729-1735. Published online Feb 7, 2016. doi: 10.3748/wjg.v22.i5.1729
Topic Highlight
Review
Basic Study
Retrospective Study
Mohammad Issa El Mouzan, Mohammed Hadi Al Edreesi, Abdulrahman Abdullah Al-Hussaini, Omar Ibrahim Saadah, Abdulaziz Abdullatif Al Qourain, Mohammad Abdullah Al Mofarreh, Khalid Abdulrahman Al Saleem 
World J Gastroenterol 22(5):1854-1858. Published online Feb 7, 2016. doi: 10.3748/wjg.v22.i5.1854
Clinical Trials Study
Tao Tan, Ya-Wei Qu, Juan Shu, Min-Li Liu, Ling Zhang, Hai-Feng Liu 
World J Gastroenterol 22(5):1869-1876. Published online Feb 7, 2016. doi: 10.3748/wjg.v22.i5.1869
Observational Study
Sabrina Cardile, Massimo Martinelli, Arrigo Barabino, Paolo Gandullia, Salvatore Oliva, Giovanni Di Nardo, Luigi Dall'Oglio, Francesca Rea, Gian Luigi de' Angelis, Barbara Bizzarri, Graziella Guariso, Enzo Masci, Annamaria Staiano, Erasmo Miele, Claudio Romano 
World J Gastroenterol 22(5):1877-1883. Published online Feb 7, 2016. doi: 10.3748/wjg.v22.i5.1877
Prospective Study
Toshio Kurihara, Ichiro Yasuda, Hiroyuki Isayama, Toshio Tsuyuguchi, Taketo Yamaguchi, Ken Kawabe, Yoshinobu Okabe, Keiji Hanada, Tsuyoshi Hayashi, Takao Ohtsuka, Syuhei Oana, Hiroshi Kawakami, Yoshinori Igarashi, Kazuya Matsumoto, Kiichi Tamada, Shomei Ryozawa, Hiroki Kawashima, Yutaka Okamoto, Iruru Maetani, Hiroyuki Inoue, Takao Itoi 
World J Gastroenterol 22(5):1891-1901. Published online Feb 7, 2016. doi: 10.3748/wjg.v22.i5.1891
Meta-Analysis
Quan-Jun Lu, Ya-Cong Bo, Yan Zhao, Er-Jiang Zhao, Wolde Bekalo Sapa, Ming-Jie Yao, Dan-Dan Duan, Yi-Wei Zhu, Wei-Quan Lu, Ling Yuan 
World J Gastroenterol 22(5):1911-1918. Published online Feb 7, 2016. doi: 10.3748/wjg.v22.i5.1911
Case Report