4. End points Primary end points: Rebleeding rate within 14 days after initial endoscopic treatment. Definition of rebleeding: the following manifestation after stabilization of vital sign for 24 hours,(1) appearance of hematemesis and bloody stool(2) need of transfusion more than 2 units of blood and vital sign change (systolic pressure < 100 mmHg or heart rate >100 beats/min).