1. Reproductive Medicine Center, Maternal & Child Health Care Hospital of Hunan Province, Changsha, 410008, China
2. Clinical Research Center for Reproduction & Genetics in Hunan Province, Reproductive & Genetic Hospital of China International Trust & Investment Corporation (CITIC) Xiangya, Changsha, 410008, China
3. National Health Commission Key Laboratory of Human Stem Cell & Reproductive Engineering, Institute of Reproductive & Stem Cell Engineering, Central South University, Changsha, 410008, China