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Open-Access Journal
Review
Michail Galanopoulos, Nikolaos Tsoukalas, Ioannis S Papanikolaou, Maria Tolia, Maria Gazouli, Gerassimos J Mantzaris 
World J Gastrointest Oncol 9(4):142-152. Published online Apr 15, 2017. doi: 10.4251/wjgo.v9.i4.142
Basic Study
Observational Study
Nastaran Hajizadeh, Mohamad Amin Pourhoseingholi, Ahmad Reza Baghestani, Alireza Abadi, Mohammad Reza Zali 
World J Gastrointest Oncol 9(4):160-165. Published online Apr 15, 2017. doi: 10.4251/wjgo.v9.i4.160
Prospective Study
Meta-Analysis