1. Schools of Food Science and Engineering and of Medical Technology, Jiangsu University, Zhenjiang, PR China
2. Research Service, Veterans Affairs Medical Center West Los Angeles, Los Angeles, CA, USA
3. Department of Medicine, University of California, Los Angeles School of Medicine, Los Angeles, CA, USA
4. Infectious Diseases Section, Veterans Affairs Medical Center West Los Angeles, Los Angeles, CA, USA
5. Department of Microbiology, Immunology and Molecular Genetics, University of California, Los Angeles School of Medicine, Los Angeles, CA, USA