1. Department of Obstetrics; Obstetrics and Gynecology Hospital of Fudan University; Shanghai China
2. Women's Health and Perinatology Research Group, Department of Clinical Medicine; UiT - The Arctic University of Norway; Tromsø Norway
3. Department of Maternal and Child Health; National Health and Family Planning Commission of the People's Republic of China; Beijing China
4. Shanghai Key Laboratory of Female Reproductive Endocrine-Related Diseases; Shanghai China
5. Department of Clinical Science, Intervention and Technology (CLINTEC), Division of Obstetrics and Gynecology; Karolinska Institute; Stockholm Sweden