1. Reproductive Medical Center, the Second Hospital affiliated to Shandong University of Traditional Chinese Medicine, Jinan, 250001, People's Republic of China.
2. Plastic Surgical Department of Qianfoshan Hospital Affiliated to Shandong University, Jinan, People's Republic of China.
3. Center for Reproductive Medicine, Provincial Hospital Affiliated to Shandong University, Jinan, China; National Research Center for Assisted Reproductive Technology and Reproductive Genetics, Jinan, China; The Key Laboratory for Reproductive Endocrinology of Ministry of Education, Jinan, China; Shandong Provincial Key Laboratory of Reproductive Medicine, Jinan, China.
4. Renji Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China.