1. State Key Laboratory of New Ceramic & Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing, China
2. Department of Stomatology, China-Japan Friendship Hospital, Beijing, China
3. Department of Oral and Maxillofacial, School of Stomatology, Dalian Medical University, Dalian, China
4. Crest Research Institute, P&G Technology (Beijing) Co., Ltd., Beijing, China