1. Department of Endocrinology, Liaocheng City People's Hospital, Liaocheng, Shandong 252000, P.R. China
2. Department of Endocrinology, Liaocheng Brain Hospital, Liaocheng, Shandong 252000, P.R. China
3. Department of the Elderly, Chongqing Medical University, Chongqing 400016, P.R. China