1. Center for Stem Cell Biology and Regenerative Medicine, Department of Basic Medical Sciences, School of Medicine, Tsinghua University, Beijing, 100084, China
2. Reproductive Medicine Center, Xiamen Maternal and Child Health Care Hospital, Xiamen, 361005, Fujian Province, China
3. Center for Genetics, National Research Institute for Family Planning, Haidian, Beijing, 100081, China
4. Department of Medical Genetics and Developmental Biology, School of Basic Medical Sciences, Capital Medical University, Beijing, 100069, China