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(A) A polyethylene bag was made by using a 3rd finger-tip of poly-glove (Hanjin, Seoul, Korea). Maximal diameter is 3 cm. (B) The maximum volume of balloon was 6 mL and air was injected into the balloon from one of the balloon tubes with the other side balloon tube closed to allow placement of the balloon within the stomach, after which the balloon tubes were immediately opened to the air.
