1. Department of Obstetrics and Gynecology, The Third Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan, China
2. Department of Surgery, Division of Surgical Oncology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA
3. University of Pittsburgh Cancer Institute, Pittsburgh, PA, USA
4. Department of Pathology, University of Pittsburgh, Pittsburgh, PA, USA
5. National Cancer Institute, Bethesda, MD, USA
6. Department of Medicine, Weill Cornell Medical College, New York, NY, USA