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.