Lin Ting-Yang1, Lin Shang-Yi2, Chen Tun-Chieh3. 1. Department of Post Baccalaureate Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan. 2. Division of Infectious Diseases, Department of Internal Medicine, Kaohsiung Medical University Hospital, Kaohsiung Medical University, Kaohsiung, Taiwan. 3. College of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan; Infection Control Office and Department of Internal Medicine, Kaohsiung Municipal Ta-Tung Hospital, Kaohsiung Medical University, Kaohsiung, Taiwan. Electronic address: idchentc@kmu.edu.tw.