1. College of Biomass Science and Engineering, Key Laboratory of Leather Chemistry and Engineering of Ministry of Education, National Engineering Laboratory for Clean Technology of Leather Manufacture, Sichuan University, Chengdu 610065, China
2. Department of Nano Engineering, University of California San Diego, 9500 Gilman Drive, La Jolla, California 92093, United States
3. Department of Biomedical Engineering, McCormick School of Engineering, Northwestern University, Evanston, Illinois 60208, United States
4. Materials Science and Engineering Program, University of California San Diego, 9500 Gilman Drive, La Jolla, California 92093, United States
5. Center of Engineering Experimental Teaching, School of Chemical Engineering, Sichuan University, Chengdu 610065, China
6. The NUANCE Center, Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, United States
7. Shu Chien─Gene Lay Department of Bioengineering, University of California San Diego, 9500 Gilman Dr, La Jolla, California 92093, United States
8. Department of Radiology, University of California San Diego, 9500 Gilman Drive, La Jolla, California 92093, United States