1. Department of Materials Science and Engineering, Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana—Champaign, Urbana, Illinois 61801, United States
2. Global Research Laboratory, Department of Biochemistry and Molecular Biology, Korea University College of Medicine, Seoul 136-713, Republic of Korea
3. Department of Mechanical Engineering, Civil and Environmental Engineering, Center for Engineering and Health, and Skin Disease Research Center, Northwestern University, Evanston, Illinois 60208, United States
4. Department of Chemical and Biomolecular Engineering,University of Illinois at Urbana—Champaign, Urbana, Illinois 61801, United States
5. Department of Melanoma Medical Oncology and Immunology, University of Texas MD Anderson Cancer Center, Houston, Texas 77054, United States
6. Center for Mechanics and Materials, Tsinghua University, Beijing 100084, China
7. Department of Biomedical Engineering, Tufts University, Medford, Massachusetts 02155, United States
8. Department of Chemistry, Mechanical Science and Engineering, and Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana—Champaign, Urbana, Illinois 61801, United States