li-qun xiao department of stomatology, the first college of clinical medical science of china three gorges university, yichang central people's hospital, yichang 443003, china hong-tao wang department of stomatology, the first college of clinical medical science of china three gorges university, yichang central people's hospital, yichang 443003, china yu-lan li department of stomatology, the first college of clinical medical science of china three gorges university, yichang central people's hospital, yichang 443003, china qing zeng department of stomatology, the first college of clinical medical science of china three gorges university, yichang central people's hospital, yichang 443003, china e zhou department of stomatology, the first college of clinical medical science of china three gorges university, yichang central people's hospital, yichang 443003, china xia ni department of stomatology, the first college of clinical medical science of china three gorges university, yichang central people's hospital, yichang 443003, china

E Zhou, Hong-tao Wang, Li-qun Xiao, Qing Zeng, Xia Ni, Yu-lan Li, Zhong-ping Huan,