1 Postgraduate student, Orthodontic Program, Department of Stomatology, Shenzhen Hospital of Guangzhou University of Chinese Medicine, 6001 Beihuan Blvd., Shenzhen, China K1H 8L1; e-mail: janejie3@foxmail.com.
2 Professor and Chief, Department of Orthodontics, Stomatological Hospital of Southern Medical University (Guangdong Provincial Stomatological Hospital), Guangzhou, China.
3 Postgraduate student, Oral Surgery Program, Third Hospital of Hebei Medical University, Shijiazhuang, China.
4 Postgraduate student, Department of Orthodontics, Stomatological Hospital of Southern Medical University (Guangdong Provincial Stomatological Hospital), Guangzhou, China.
5 Postgraduate student, Orthodontic Program, Shenzhen Stomatological Hospital of Southern Medical University, Shenzhen, China.
6 Professor and Director of Hospital, Shenzhen Stomatological Hospital of Southern Medical University, Shenzhen, China.