Letter to the Editor: Authors' Response.
Department of Preventive Dentistry, Guanghua School of Stomatology, Hospital of Stomatology, Sun Yat-sen University, Guangzhou, China, and Guangdong Provincial Key Laboratory of Stomatology, Sun Yat-sen University.
Hongchun
H
Liu
Department of Preventive Dentistry, West China College of Stomatology, Sichuan University, Chengdu, China.
Wei
W
Yin