[1] Sichuan Univ, West China Hosp Stomatol, Natl Ctr Stomatol, Natl Clin Res Ctr Oral Dis,State Key Lab Oral Dis, Chengdu, Peoples R China
[2] Sichuan Univ, West China Hosp, West China Sch Nursing, Dept Emergency Med,Nursing Key Lab Sichuan Prov, Chengdu, Peoples R China
[3] Sichuan Univ, West China Sch Publ Hlth, West China PUMC CC Chen Inst Hlth, Chengdu, Peoples R China
[4] Sichuan Univ, West China Hosp 4, Chengdu, Peoples R China
[5] Sichuan Univ, Ctr Archaeol Sci, Chengdu, Peoples R China