1. State Key Laboratory of Military Stomatology & National Clinical Research Center for Oral Diseases & Shaanxi International Joint Research Center for Oral Diseases Center for Tissue Engineering School of Stomatology The Fourth Military Medical University Xi'an Shaanxi China
2. Department of Anatomy and Cell Biology School of Dental Medicine University of Pennsylvania Philadelphia Pennsylvania USA
3. Department of Prosthodontics National Laboratory for Digital and Material Technology of Stomatology Beijing Key Laboratory of Digital Stomatology National Clinical Research Center for Oral Diseases Peking University School and Hospital of Stomatology Beijing China
4. South China Center of Craniofacial Stem Cell Research Guanghua School and Hospital of Stomatology Sun Yat‐sen University Guangzhou Guangdong China