1. Department of Endocrinology, Key Lab of Endocrinology, Ministry of Health, Peking Union Medical College Hospital (PUMCH), Chinese Academy of Medical Sciences & Peking Union Medical College (CAMS & PUMC), Beijing, China
2. Intern of Medicine, PUMCH, Beijing, China
3. School of Public Health, PUMC, Beijing, China
4. Hebei Center for Women and Children's Health, Shijiazhuang, China