1. Department of Cardiology, The First Affiliated Hospital, Xinjihypang Medical University, Urumqi, Xinjiang 830000, P.R. China
2. Department of Cardiology, Shanghai Xuhui Central Hospital, Shanghai 200031, P.R. China
3. Department of Geriatrics, Xinjiang Military General Hospital, Urumqi, Xinjiang 830000, P.R. China
4. Department of Internal Medicine, The First Affiliated Hospital, Xinjiang Medical University, Urumqi, Xinjiang 830000, P.R. China