1. Division of Infectious Diseases, Department of Internal Medicine, E-Da Hospital, I-Shou University, Kaohsiung 824, Taiwan
2. School of Medicine, College of Medicine, I-Shou University, Kaohsiung 824, Taiwan
3. Division of Infectious Diseases, Department of Internal Medicine, Kaohsiung Medical University Hospital, Kaohsiung Medical University, Kaohsiung 807, Taiwan
4. Clinical Medicine Research Center, National Cheng Kung University Hospital, College of Medicine, National Cheng Kung University, Tainan 704, Taiwan
5. Division of Infectious Diseases, Department of Internal Medicine, National Cheng Kung University Hospital, Tainan 704, Taiwan
6. School of Medicine, College of Medicine, National Cheng Kung University, Tainan 704, Taiwan
7. Division of Infectious Diseases, Department of Internal Medicine, Taichung Veterans General Hospital, Taichung 407, Taiwan
8. Department of Biological Science and Technology, Meiho University, Pingtung 912, Taiwan
9. Department of Critical Care Medicine, E-Da Hospital, I-Shou University, Kaohsiung 824, Taiwan