1. Department of Laboratory Medicine, Beijing Obstetrics and Gynecology Hospital, Capital Medical University, Beijing Maternal and Child Health Care Hospital, Beijing, PR China
2. Center of Clinical Mass Spectrometry, Beijing Obstetrics and Gynecology Hospital, Capital Medical University, Beijing Maternal and Child Health Care Hospital, Beijing, PR China
3. Health Biotech Co. Ltd, Beijing, PR China
4. Department of Internal Medicine, Beijing Obstetrics and Gynecology Hospital, Capital Medical University, Beijing Maternal and Child Health Care Hospital, Beijing, PR China
5. Central Laboratory, Beijing Obstetrics and Gynecology Hospital, Capital Medical University, Beijing Maternal and Child Health Care Hospital, Beijing, PR China
6. Department of Obstetrics, Beijing Obstetrics and Gynecology Hospital, Division of Endocrinology and Metabolism, Capital Medical University, Beijing Maternal and Child Health Care Hospital, Beijing, PR China