1. Department of Bioengineering, University of California, Berkeley, California 94720, United States
2. Biological Systems and Engineering, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
3. Department of Applied Science and Technology, University of California, Berkeley, California 94720, United States
4. Department of Conservative Dentistry and Dental Research Institute, School of Dentistry, Seoul National University, Seoul 03080, Republic of Korea