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Mei-Due Yang, Chia-Wen Tsai, Wen-Shin Chang, Yung-An Tsou, Cheng-Nan Wu, Da-Tian Bau 
World J Gastrointest Oncol 3(12):175-181. Published online Dec 15, 2011. doi: 10.4251/wjgo.v3.i12.175