1. Department of Physiology, School of Basic Medical Science, Chongqing Medical University, Chongqing 400016, China
2. Department of Biostatistics, School of Public Health, Chongqing Medical University, Chongqing 400016, China
3. Joint International Research Laboratory of Reproduction, Development of the Ministry of Education of China, School of Public Health and Management, Chongqing Medical University, Chongqing 400016, China
4. Department of Medicine, Division of Endocrinology, Diabetes and Hypertension, Brigham and Women’s Hospital, Harvard Medical School, Boston, MA 02115, USA