1. Department of Obstetrics and Gynecology, Virginia Commonwealth University, Richmond, VA 23298, USA
2. Department of Otorhinolaryngology, University of Pennsylvania, Philadelphia, PA 19104, USA
3. Department of Infectious Diseases, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei 430030, China
4. School of Public Health, Wuhan University of Science and Technology, Wuhan, Hubei 430081, China
5. Department of Biostatistics, Virginia Commonwealth University, Richmond, VA 23298, USA
6. Department of Biochemistry & Molecular Biology, Virginia Commonwealth University, Richmond, VA 23298, USA
7. Department of Pathology and Laboratory Medicine, University of North Carolina, Chapel Hill, NC 27599, USA