Zhipeng Cao1, Baoli Zhu2. 1. Department of Forensic Pathology, China Medical University School of Forensic Medicine, No. 77, Puhe Road, Shenyang North New Area, Shenyang, 110122, Liaoning Province, People's Republic of China. 2. Department of Forensic Pathology, China Medical University School of Forensic Medicine, No. 77, Puhe Road, Shenyang North New Area, Shenyang, 110122, Liaoning Province, People's Republic of China. zhu1127@hotmail.com.