1. Center for Disease Control and Prevention, Western Theater Command, Lanzhou, PR China
2. School of Nursing, Lanzhou University, Lanzhou, PR China
3. Department of Emergency Medicine, The General Hospital of Western Theater Command, Chengdu, PR China
4. NMPA Key Laboratory for Quality Control of Blood Products, Institute of Health Service and Transfusion Medicine, Academy of Military Medical Sciences, Beijing, PR China
5. Department of Neurology, Chengdu Third People’s Hospital, Chengdu, PR China