1. Department of Infectious Diseases; Huashan Hospital; Shanghai Medical College; Fudan University; Shanghai, China
2. Department of General Surgery; Huashan Hospital; Shanghai Medical College; Fudan University; Shanghai, China
3. Department of pathology; Huashan Hospital; Shanghai Medical College; Fudan University; Shanghai, China
4. Department of Molecular Microbiology and Immunology; Bloomberg School of Public Health; Johns Hopkins University; Baltimore, MD USA