H H Yen1,2, K H Lin3, C J Chen4. 1. Department of Gastroenterology, Changhua Christian Hospital, Changhua, Taiwan. 2. General Education Center, Chienkuo Technology University, Changhua, Taiwan. 3. Department of Surgery, Changhua Christian Hospital, Changhua, Taiwan. 4. Department of Pathology, Changhua Christian Hospital, Changhua, Taiwan.