1. Department of Obstetrics and Gynecology, Key Laboratory of Birth Defects and Related Diseases of Women and Children of Ministry of Education, West China Second Hospital and State Key Laboratory of Biotherapy/Collaborative Innovation Center, West China Hospital, Sichuan University, Chengdu, P. R. China
2. Department of Emergency Medicine, Thomas Jefferson University Hospital, U.S.A
3. Department of Emergency Medicine, Kaiser Permanente Santa Clara Medical Center, Affiliate of Stanford University, U.S.A
4. Department of Orthopedics, West China Hospital, Sichuan University, Chengdu, P. R. China
5. College of Life Sciences, Sichuan University, Chengdu, P. R. China
6. Department of Gastrointestinal Surgery, West China Hospital, Sichuan University, Chengdu, P.R. China
7. Department of Pathology, West China Second Hospital, Sichuan University, Chengdu, P. R. China