[1] Sichuan Univ, West China Hosp Stomatol, Natl Clin Res Ctr Oral Dis, State Key Lab Oral Dis, Chengdu, Sichuan, Peoples R China
[2] Sichuan Univ, West China Hosp Stomatol, Dept Oral Implantol, Chengdu, Sichuan, Peoples R China
[3] First Peoples Hosp Qujing, Dept Stomatol, Qujing, Peoples R China
[4] Sichuan Univ, West China Hosp Stomatol, Dept Pediat Dent, Chengdu 610041, Sichuan, Peoples R China