1. Department of General Thoracic Surgery; The General Hospital of PLA; Beijing China
2. Department of Digestive Disease; the Second affiliated hospital of Chongqing Medical University; Chongqing China
3. Department of Emergency; The General Hospital of PLA; Beijing China
4. Department of Orthopedics; The General Hospital of PLA; Beijing China
5. The Medico-technical Division; The General Hospital of PLA; Beijing China
6. Harvard T.H.Chan School of Public Health; Boston Massachusetts
7. Department of General Surgery; The General Hospital of PLA; Beijing China