Key Laboratory of Medical Image Computing of Ministry of Education, Northeastern University, Shenyang, China.|Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts, United States of America.|Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts, United States of America.|Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts, United States of America.|Key Laboratory of Medical Image Computing of Ministry of Education, Northeastern University, Shenyang, China.|Division of Applied Mathematics, Brown University, Providence, Rhode Island, United States of America.