Department of Orthodontics and Research Center for Stomatology;
Stomatological Hospital;
Xi'an Jiaotong University;
Xi'an 710004;
China Department of Public Health;
Medical College;
Xi'an Jiaotong University;
Xi'an 710061;
China;
Department of Stomatology;
Shaanxi Provincial Corps Hospital;
Chinese People's Armed Police Forces;
Xi'an 710054;
China;
Department of Public Health;
Medical College;
Xi'an Jiaotong University;
Xi'an 710061;
China;
Department of Orthodontics and Research Center for Stomatology;
Stomatological Hospital;
Xi'an Jiaotong University;
Xi'an 710004;
China;