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Case Control Study
Retrospective Study
Randomized Controlled Trial
Leonardo Zorrón Cheng Tao Pu, Kuan Loong Cheong, Doreen Siew Ching Koay, Sze Pheh Yeap, Amanda Ovenden, Mahima Raju, Andrew Ruszkiewicz, Philip W Chiu, James Y Lau, Rajvinder Singh 
World J Gastrointest Endosc 10(9):210-218. Published online Sep 16, 2018. doi: 10.4253/wjge.v10.i9.210
Case Report