1. Department of Obstetrics, Gynecology and Reproductive Sciences, Yale University School of Medicine, New Haven, Connecticut, USA
2. Yale Stem Cell Center, Yale University School of Medicine, New Haven, Connecticut, USA
3. Cancer Research Institute, Central South University, Hunan, People's Republica of China
4. Department of Genetics and Developmental Biology, University of Connecticut Stem Cell Institute, University of Connecticut Health Center, Farmington, Connecticut, USA
5. Department of Chemistry, Wenzhou University, Zhejiang, People's Republic of China