Fei Guo1, Lu Zhang1, Xianhua Jiang2. 1. Department of Forensic Medicine, National Police University of China, No.83, Tawan Street, Huanggu District, Shenyang, Liaoning 110854, China; Criminal Science and Technology Institute of Liaoning Province, No.2, Qishan Middle Road, Huanggu District, Shenyang, Liaoning 110032, China. 2. Department of Forensic Medicine, National Police University of China, No.83, Tawan Street, Huanggu District, Shenyang, Liaoning 110854, China; Criminal Science and Technology Institute of Liaoning Province, No.2, Qishan Middle Road, Huanggu District, Shenyang, Liaoning 110032, China. Electronic address: jiangxianhua_2006@aliyun.com.