1. Department of Endocrinology, Beijing Jishuitan Hospital, Beijing 100035, P.R. China
2. Department of Genitourinary, Cancer Medicine, MD Anderson Cancer Center, University of Texas, Houston, TX 77030, USA
3. Department of Endocrinology, First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu 210029, P.R. China
4. Department of Endocrinology, First Affiliated Hospital of Medical College of Xi'an Jiaotong University, Xi'an, Shaanxi 710061, P.R. China