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João Mangualde, Marie I Cremers, Ana M Vieira, Ricardo Freire, Élia Gamito, Cristina Lobato, Ana L Alves, Fátima Augusto, Ana P Oliveira 
World J Gastrointest Endosc 3(10):195-200. Published online Oct 16, 2011. doi: 10.4253/wjge.v3.i10.195