1. Department of Geriatrics, The First Affiliated Hospital of Fujian Medical University, Fuzhou, Fujian 350005, P.R. China
2. Department of General Medicine, The First Affiliated Hospital of Fujian Medical University, Fuzhou, Fujian 350005, P.R. China
3. Fujian Institute of Hypertension, The First Affiliated Hospital of Fujian Medical University, Fuzhou, Fujian 350005, P.R. China