1. Department of Geriatrics Chinese Medicine Hospital Affiliated to Southwest Medical University, Luzhou, Sichuan 646000, P.R. China
2. Ultrasonography Laboratory, Chinese Medicine Hospital Affiliated to Southwest Medical University, Luzhou, Sichuan 646000, P.R. China
3. Department of Cardiology, Xiangyang Central Hospital, Affiliated Hospital of Hubei University of Arts and Science, Xiangyang, Hubei 441021, P.R. China