[1]State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, Department of Preventive Dentistry, West China Hospital of Stomatology, SichtJan University, Chengdu, China;
[2]Sichuan Center for Disease Control and Prevention, Chengdu, China;
[3]The Third People's Hospital of Chengdu, Chengdu, China;
[4]Sichuan Academy of Medical Sciences & Sichuan Provincial People's Hospital, Chengdu, China;
[5]Department of Stomatolosy, North Sichuan Medical College, First Affiliated Hospital, Nanchong, China;
[6]Department of Stomatology, Southwest Medical University, Luzhou, China and;
[7]State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, West China Hospital of Stomatolosy, Sichuan University, Chengdu, China;