1. Department of Oncology, Affiliated Hospital of Weifang Medical College, Weifang, Shandong 261000, P.R. China
2. Department of Endocrinology and Metabolism, Affiliated Hospital of Weifang Medical College, Weifang, Shandong 261000, P.R. China
3. Department of Endocrinology, Yancheng Third People's Hospital, Yancheng, Jiangsu 224001, P.R. China
4. Graduate School, Weifang Medical College, Weifang, Shandong 261000, P.R. China