1. Department of Geriatric Medicine, The Second Affiliated Hospital of Zhejiang University School of Medicine, Hangzhou, Zhejiang 310009, P.R. China
2. College of Medical Technology, Zhejiang Chinese Medical University, Hangzhou, Zhejiang 310053, P.R. China
3. Department of Internal Medicina, Shangcheng District Hospital of Traditional Chinese Medicine, Hangzhou, Zhejiang 310000, P.R. China