1. Department of Cardiology, The First Affiliated Hospital of the Medical College, Shihezi University, Shihezi, Xinjiang 832000, P.R. China
2. Department of General Surgery, The First Affiliated Hospital of the Medical College, Shihezi University, Shihezi, Xinjiang 832000, P.R. China
3. Department of Gerontology, The First Affiliated Hospital of the Medical College, Shihezi University, Shihezi, Xinjiang 832000, P.R. China
4. Department of Internal Medicine, Affiliated Midong Hospital of the People's Hospital of Xinjiang Uygur Autonomous Region, Urumqi, Xinjiang 830000, P.R. China