[1] Univ Tennessee, Dept Mat Sci & Engn, Knoxville, TN 37996 USA
[2] Oak Ridge Natl Lab, Biosci Div, Oak Ridge, TN 37831 USA
[3] Mayo Clin, Coll Med, Dept Biomed Engn, Rochester, MN 55905 USA
[4] Mayo Clin, Coll Med, Dept Orthoped Surg, Rochester, MN 55905 USA
[5] Univ Minnesota, Dept Biomed Engn, Minneapolis, MN 55455 USA
[6] Zhejiang Univ, Dept Polymer Sci & Engn, Hangzhou 310027, Zhejiang, Peoples R China
[7] Univ Waterloo, Waterloo Inst Nanotechnol, Dept Chem, Waterloo, ON N2L 3G1, Canada