[1] Fourth Mil Med Univ, Dept Epidemiol, Xian 710032, Peoples R China
[2] Southwest Med Univ, Sch Publ Hlth, Luzhou 646000, Peoples R China
[3] Southwest Med Univ, Affiliated Stomatol Hosp, Dept Oral Implantol, Luzhou 646000, Peoples R China
[4] Southwest Med Univ, Inst Stomatol, Luzhou Key Lab Oral & Maxillofacial Reconstruct &, Luzhou 646000, Peoples R China
[5] PLA Rocket Force Characterist Med Ctr, Dept Stomatol, Beijing 100000, Peoples R China
[6] Shanghai Univ Tradit Chinese Med, Shuguang Hosp, Dept Stomatol, Shanghai 201203, Peoples R China
[7] Xichang Peoples Hosp, XiChang 615000, Peoples R China
[8] Fourth Mil Med Univ, Sch Stomatol, State Key Lab Oral & Maxillofacial Reconstruct & R, Natl Clin Res Ctr Oral Dis,Shaanxi Key Lab Stomato, Xian 710032, Peoples R China