1. Ningbo Research Institute, Zhejiang University, Ningbo, China
2. Polytechnic Institute, Zhejiang University, Hangzhou, China
3. State Key Laboratory of CAD&CG and the School of Mechanical Engineering, Zhejiang University, Hangzhou, China
4. State Key Laboratory Breeding Base of Basic Science of Stomatology (Hubei-MOST) and the Key Laboratory of Oral Biomedicine Ministry of Education, School and Hospital of Stomatology, Wuhan University, Wuhan, China