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Duodenal balloon occlusion method. (A) A nylon thread was used to make a loop at the tip of a balloon that was designed for use in esophageal variceal sclerotherapy (length, 52 mm; inner diameter, 10 mm). (B) The loop was grasped with forceps, inserted into the duodenal bulb, inflated with 60–70 ml of air and placed in an indwelling manner.
