1. Department of Epidemiology and Biostatistics, School of Public Health; Tianjin Medical University; Tianjin China
2. Department of Endocrinology; Peking University People's Hospital; Beijing China
3. Department of Endocrinology; Chinese PLA General Hospital; Beijing China
4. Department of Endocrinology; Peking University Third Hospital; Beijing China
5. Department of Endocrinology; The Fourth Military Medical University Xi Jing Hospital; Xi'an China
6. Department of Endocrinology; Beijing Hospital; Beijing China
7. Department of Endocrinology; Changhai Hospital of Shanghai; Shanghai China