1. Department of Internal Medicine-Cardiovascular, The Second Hospital of Anhui Medical University, No. 678, Furong Road, Economic Development Zone, Hefei 230601, P.R. China
2. Department of Endocrinology, Anhui No.2 Provincial People’s Hospital, No. 1868, North Second Ring Dangshan Road, Yaohai District, Hefei 230041, P.R. China
3. Department of Geriatric Cardiology, The First Affiliated Hospital of Anhui Medical University, No. 218, Jixi Road, Hefei 230022, P.R. China