Machine generated contents note: ch. 1 Omentectomy As a Procedure for the Co-Morbidities of Obesity / Michelle Foster -- ch. 2 Bariatric Surgery: Indications and Complications / Aziz M. Merchant -- ch. 3 Atrial Fibrillation after Surgery / Juan P. Cata -- ch. 4 Perioperative Period, Stress Response, Immune Suppression and Cancer Recurrence / Juan P. Cata -- ch. 5 Perioperative Blood Transfusions and Its Complications / Juan P. Cata -- ch. 6 Gastroesophageal Reflux Disease: Pathophysiological and Therapeutic Considerations / Rishi Sharma -- ch. 7 Hydatid Liver Cyst / Rajni Gupta.