1. Department
of Orthopedic Surgery, Stanford University 300 Pasteur Drive, Stanford, California 94305, United States
2. School
of Stomatology, Lanzhou University 199 Donggang West Road, Lanzhou, Gansu 730000, China
3. Department
of Materials Science and Engineering, Stanford University, 300 Pasteur
Drive, Stanford, California 94305, United States