1. Department of Assisted Reproduction, Shanghai Ninth People’s Hospital, Shanghai Jiao Tong University School of Medicine, Zhizaoju Road No. 639, Shanghai 200011, People’s Republic of China
2. Shanghai First Maternity and Infant Hospital, Tongji University School of Medicine, Gaokexi Road No. 2699, Shanghai 201204, People’s Republic of China
3. Shanghai-Hamburg College, University of Shanghai for Science and Technology, Jungong Road No. 516, Shanghai 200093, People’s Republic of China
4. Department of Obstetrics and Gynaecology, Monash University, 246 Clayton Road, Clayton 3168, Victoria, Australia