1. Center for Reproductive Medicine, Peking University Shenzhen Hospital, Shenzhen, Guangdong, China;
2. Shantou University Medical College, Shantou, Guangdong, China;
3. Department of Gynecology & Obstetrics, Nanshan People’s Hospital, Nan Shan District, Shenzhen, Guangdong, China;
4. Division of Reproductive Endocrinology & Infertility, Department of Obstetrics, Gynecology, & Reproductive Sciences, Yale University School of Medicine, CT USA