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Case Control Study
Retrospective Cohort Study
Krashna Patel, Khaled Dajani, Satheesh Iype, Nikolaos A Chatzizacharias, Saranya Vickramarajah, Prateush Singh, Susan Davies, Rebecca Brais, Siong S Liau, Simon Harper, Asif Jah, Raaj K Praseedom, Emmanuel L Huguet 
World J Gastrointest Surg 8(10):685-692. Published online Oct 27, 2016. doi: 10.4240/wjgs.v8.i10.685
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