1. Shaanxi Key Laboratory for Animal Conservation, Key Laboratory of Resource Biology and Biotechnology in Western China, Ministry of Education, College of Life Science, Northwest University, Xi'an, China.
2. Department of Experimental Surgery of Xijing Hospital, The Fourth Military Medical University, Xi'an, China.
3. Department of Obstetrics & Gynecology, Tangdu Hospital, The Fourth Military Medical University, Xi'an, China.
4. Key Laboratory of Fertility Preservation and Maintenance, Ministry of Education, Yinchuan, China.
5. Institute of Biomedicine, Pharmacology, Biomedicum Helsinki, University of Helsinki, Helsinki, Finland.