1. Department of Obstetrics and Gynecology, Peking Union Medical College Hospital, Peking Union Medical College & Chinese Academy of Medical Science, Beijing, People’s Republic of China
2. Department of Obstetrics, Gynecology, and Reproductive Sciences, Yale School of Medicine, New Haven, CT, USA
3. Department of Neurology, Beijing Tiantan Hospital, Capital Medical University, Beijing, People’s Republic of China