1. Department of OB/GYN, Stanford University School of Medicine, Stanford, California.
2. The Center for Reproductive Medicine, OB/GYN, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong, People's Republic of China.
3. The Department of OB/GYN, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, People's Republic of China.
4. Department of Pathology, Stanford University School of Medicine, Stanford, California.
5. Department of Cell Biology and Neurosciences and Department of Chemistry and Biochemistry, Montana State University, Bozeman, Montana.