1. Department of Endocrinology, Zhongnan Hospital of Wuhan University, Wuhan, Hubei, China (mainland)
2. Department of Endocrinology, Huhhot 1st Hospital, Huhhot, Inner Mongolia, China (mainland)
3. Department of Obstetrics, Huhhot 1st Hospital, Huhhot, Inner Mongolia, China (mainland)
4. Department of Obstetrics, Inner Mongolia People’s Hospital, Huhhot, Inner Mongolia, China (mainland)
5. Department of internal Medicine, Maternal and Child Health Hospital of Inner Mongolia, Huhhot, Inner Mongolia, China (mainland)