Chang-Hua Chen1, Shun-Sheng Wu2, Ru-Hua Hsiu3. 1. Division of Infectious Disease, Changhua Christian Hospital, Changhua, Taiwan; Center for Infectious Diseases Research, Changhua Christian Hospital, Changhua City, Taiwan. Electronic address: 76590@cch.org.tw. 2. Division of Gastroenterology, Changhua Christian Hospital, Changhua, Taiwan. 3. Department of Laboratory Medicine, Changhua Christian Hospital, Changhua, Taiwan.