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Editorial
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Review
Minireviews
Basic Study
Aldona Kasprzak, Agnieszka Adamek, Wiesława Przybyszewska, Przemysław Pyda, Jacek Szmeja, Agnieszka Seraszek-Jaros, Agata Lanzafame, Anna Surdacka, Iwona Mozer-Lisewska, Maria Koczorowska 
World J Gastroenterol 21(13):3867-3875. Published online Apr 7, 2015. doi: 10.3748/wjg.v21.i13.3867
Case Control Study
Haruya Ishiguro, Hiroshi Abe, Nobuyoshi Seki, Tomonori Sugita, Yuta Aida, Munenori Itagaki, Satoshi Sutoh, Noritomo Shimada, Tomomi Furihata, Akihito Tsubota, Yoshio Aizawa 
World J Gastroenterol 21(13):3904-3911. Published online Apr 7, 2015. doi: 10.3748/wjg.v21.i13.3904
Retrospective Cohort Study
Stefano Gitto, Luca Saverio Belli, Ranka Vukotic, Stefania Lorenzini, Aldo Airoldi, Arrigo Francesco Giuseppe Cicero, Marcello Vangeli, Lucia Brodosi, Arianna Martello Panno, Roberto Di Donato, Matteo Cescon, Gian Luca Grazi, Luciano De Carlis, Antonio Daniele Pinna, Mauro Bernardi, Pietro Andreone 
World J Gastroenterol 21(13):3912-3920. Published online Apr 7, 2015. doi: 10.3748/wjg.v21.i13.3912
Retrospective Study
Seung In Seo, Hyoung Su Kim, Won Jin Kim, Woon Geon Shin, Doo Jin Kim, Kyung Ho Kim, Myoung Kuk Jang, Jin Heon Lee, Joo Seop Kim, Hak Yang Kim, Dong Joon Kim, Myung Seok Lee, Choong Kee Park 
World J Gastroenterol 21(13):3928-3935. Published online Apr 7, 2015. doi: 10.3748/wjg.v21.i13.3928
Jing-Huan Li, Xiao-Ying Xie, Lan Zhang, Fan Le, Ning-Ling Ge, Li-Xin Li, Yu-Hong Gan, Yi Chen, Ju-Bo Zhang, Tong-Chun Xue, Rong-Xin Chen, Jing-Lin Xia, Bo-Heng Zhang, Sheng-Long Ye, Yan-Hong Wang, Zheng-Gang Ren 
World J Gastroenterol 21(13):3970-3977. Published online Apr 7, 2015. doi: 10.3748/wjg.v21.i13.3970
Clinical Trials Study
Observational Study
Prospective Study
Dalibor Opačić, Nadan Rustemović, Mirjana Kalauz, Pave Markoš, Zvonimir Ostojić, Matea Majerović, Iva Ledinsky, Ana Višnjić, Juraj Krznarić, Milorad Opačić 
World J Gastroenterol 21(13):4014-4019. Published online Apr 7, 2015. doi: 10.3748/wjg.v21.i13.4014
Jian-Zhuang Ren, Meng-Fan Zhang, Ai-Mei Rong, Xiang-Jie Fang, Kai Zhang, Guo-Hao Huang, Peng-Fei Chen, Zhao-Yang Wang, Xu-Hua Duan, Xin-Wei Han, Yan-Jie Liu 
World J Gastroenterol 21(13):4030-4037. Published online Apr 7, 2015. doi: 10.3748/wjg.v21.i13.4030
Meta-Analysis
Chang Seok Bang, In Soo Shin, Sung Wha Lee, Jin Bong Kim, Gwang Ho Baik, Ki Tae Suk, Jai Hoon Yoon, Yeon Soo Kim, Dong Joon Kim 
World J Gastroenterol 21(13):4038-4047. Published online Apr 7, 2015. doi: 10.3748/wjg.v21.i13.4038
Case Report
J Todd Kuenstner, William Chamberlin, Saleh A Naser, Michael T Collins, Coad Thomas Dow, John M Aitken, Stuart Weg, Grzegorz Telega, Kuruvilla John, David Haas, Torsten M Eckstein, Maher Kali, Christine Welch, Thomas Petrie 
World J Gastroenterol 21(13):4048-4062. Published online Apr 7, 2015. doi: 10.3748/wjg.v21.i13.4048
Francesco Giuseppe Foschi, Maria Cristina Morelli, Sara Savini, Anna Chiara Dall’Aglio, Arianna Lanzi, Matteo Cescon, Giorgio Ercolani, Alessandro Cucchetti, Antonio Daniele Pinna, Giuseppe Francesco Stefanini 
World J Gastroenterol 21(13):4063-4068. Published online Apr 7, 2015. doi: 10.3748/wjg.v21.i13.4063
José Ferrusquía, Isabel Pérez-Martínez, Ricardo Gómez de la Torre, María Luisa Fernández-Almira, Ruth de Francisco, Luis Rodrigo, Sabino Riestra 
World J Gastroenterol 21(13):4069-4077. Published online Apr 7, 2015. doi: 10.3748/wjg.v21.i13.4069
Mahmut Yuksel, Fatih Saygili, Orhan Coskun, Nuretdin Suna, Mustafa Kaplan, Ufuk Baris Kuzu, Zeki Mesut Yalin Kilic, Yasemin Ozderin Ozin, Ertugrul Kayacetin 
World J Gastroenterol 21(13):4078-4081. Published online Apr 7, 2015. doi: 10.3748/wjg.v21.i13.4078
Letters To The Editor