1. Department of Cardiovascular Surgery; Xijing Hospital; The Fourth Military Medical University; Xi'an China
2. Department of Biomedical Engineering; The Fourth Military Medical University; Xi'an China
3. Department of Thoracic Surgery; Tangdu Hospital; The Fourth Military Medical University; Xi'an China
4. Department of Aerospace Medicine; The Fourth Military Medical University; Xi'an China
5. Departments of Geriatrics; Xijing Hospital; The Fourth Military Medical University; Xi'an China