1. State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China
2. West China School of Public Health and West China Fourth Hospital, Sichuan University, Chengdu, China
3. State Key Laboratory of Agricultural Microbiology, College of Biomedicine and Health, College of Food Science and Technology, Huazhong Agricultural University, Wuhan, China
4. Center for Archaeological Science, Sichuan University, Chengdu, China