Huijie Lu1, Pingming Qiu1, Chao Liu2, Weian Du1, Ling Chen3. 1. Department of Forensic Genetics, School of Forensic Medicine, Southern Medical University, Guangzhou, Guangdong Province 510515, PR China. 2. Department of Forensic Genetics, School of Forensic Medicine, Southern Medical University, Guangzhou, Guangdong Province 510515, PR China; Guangzhou Forensic Science Institute, Guangzhou, Guangdong Province 510030, PR China. 3. Department of Forensic Genetics, School of Forensic Medicine, Southern Medical University, Guangzhou, Guangdong Province 510515, PR China. Electronic address: lingpzy@163.com.