1. Department of Orthopaedic Surgery Stanford University California CA 94305 USA
2. School of Pharmacy Chongqing Medical University Chongqing 400016 China
3. Department of Prosthodontics Yonsei University College of Dentistry Seoul 120‐752 Korea
4. Department of Mechanical Engineering Stanford University California CA 94305 USA
5. School of Biomedical Informatics The University of Texas Health Science Center at Houston Houston TX 77030 USA
6. Department of Materials Science and Engineering Stanford University California CA 94305 USA
7. Department of Bioengineering Stanford University California CA 94305 USA