Affiliation: | a Department of Obstetrics and Gynecology, Peking University Third Hospital, Beijing, People’s Republic of China b Key Laboratory of Assisted Reproduction, Ministry of Education, Beijing, People’s Republic of China c State Key Laboratory of Reproductive Biology, Institute of Zoology, Beijing, People’s Republic of China d Center for Human Reproduction, North Shore University Hospital, School of Medicine, Hofstra University, Manhasset, New York |