1. Institute of Organ Transplantation, The 309th Hospital of Chinese People's Liberation Army, Beijing 100091, P.R. China
2. Department of Neurosurgery, General Hospital of Jinan Military Command, Jinan, Shandong 250031, P.R. China
3. Experimental Animal Centre, Liaoning University of Traditional Chinese Medicine, Shenyang, Liaoning 110032, P.R. China
4. Department of Anesthesia, Shenzhen People's Hospital, Shenzhen, Guangdong 5188020, P.R. China