1. Research Center for Bacterial Pathogenesis and Department of Microbiology and Immunology, Chang-Gung University, Kwei-Shan, Taoyuan 333, Taiwan
2. Institute of Biochemistry, National Chung-Hsing University, Taichung 402, Taiwan
3. Department of Health and Nutrition, Chia Nan University of Pharmacy and Science, Tainan 701, Taiwan