[1]Department of Obstetrics and Gynecology, The Affiliated Drum Tower Hospital of Nanjing University Medical School, Nanjing 210008, China;
[2]Center for Reproductive Medicine, Department of Obstetrics and Gynecology, The Affiliated Drum Tower Hospital of Nanjing University Medical School, Nanjing 210008, China;
[3]Department of Pathology, The Affiliated Drum Tower Hospital of Nanjing University Medical School, Nanjing 210008, China;
[4]Nanjing Center for Stem Cells and Biomaterials, The Affiliated Drum Tower Hospital of Nanjing University Medical School Nanjing 210008, China;
[5]The Affiliated Drum Tower Hospital of Nanjing University Medical School, Nanjing 210008, China;
[6]Instituteof Genetics and Developmental Biology, Chinese Academy of Sciences, Beijung 100190, China;
[7]Department of Obstetrics, Gynecology and Reproductive Sciences, Center for Reproductive Sciences,Eli and Edythe Broad Center of Regeneration Medicine and Stern Cell Research, University of California San Francisco, San Francisco 94143, USA;