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Schematic diagram illustrating the normal upper GI anatomy (a) and the two most commonly performed bariatric surgical procedures in the world with relative percentages. The metabolic procedures: b RYGB and c SG (surgical technique described in details in the main text). RYGB were the 39.6% and SG were the 45.9% of the total procedures performed in 2014 [12]. RYGB Roux-en-Y gastric bypass, SG Sleeve gastrectomy
