1. Department of Functional Examination, Northern Jiangsu People's Hospital, The Affiliated Hospital of Yangzhou University, Yangzhou, Jiangsu 225000, P.R. China
2. Department of Geriatrics, The First Affiliated Hospital of Xinjiang Medical University, Urumchi, Xinjiang Uyghur Autonomous Region 830000, P.R. China
3. Department of Functional Science, Karamay College of Xinjiang Medical University, Karamay, Xinjiang Uyghur Autonomous Region 834000, P.R. China
4. Department of Clinical Teaching, Karamay College of Xinjiang Medical University, Karamay, Xinjiang Uyghur Autonomous Region 834000, P.R. China
5. Department of Morphology, Karamay College of Xinjiang Medical University, Karamay, Xinjiang Uyghur Autonomous Region 834000, P.R. China
6. Department of Cardiology, The First Affiliated Hospital of Xinjiang Medical University, Urumchi, Xinjiang Uyghur Autonomous Region 830000, P.R. China