1. Department of Obstetrics and Gynecology, Shanghai Tenth People's Hospital of Tongji University, Shanghai, China; Department of Pathology, Johns Hopkins Medical Institutions, Baltimore, MD, United States
2. Department of Pathology, Johns Hopkins Medical Institutions, Baltimore, MD, United States
3. Department of Gynecology and Obstetrics, Zhujiang Hospital of Southern Medical University, Guangzhou, Guangdong province, China; Department of Pathology, Johns Hopkins Medical Institutions, Baltimore, MD, United States
4. Department of Obstetrics and Gynecology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China; Department of Pathology, Johns Hopkins Medical Institutions, Baltimore, MD, United States
5. Department of Pathology; Johns Hopkins Medical Institutions, Baltimore, MD, United States
6. Department of Pathology and Department of Oncology, Johns Hopkins Medical Institutions, Baltimore, MD, United States
7. Departments of Pathology, Department of Obstetrics and Gynecology, Department of Molecular Microbiology and Immunology, and Department of Oncology, Johns Hopkins Medical Institutions, Baltimore, MD, United States