[1] Johns Hopkins Sch Med, Translat Tissue Engn Ctr, Baltimore, MD 21287 USA
[2] Johns Hopkins Univ, Dept Mat Sci & Engn, Baltimore, MD 21218 USA
[3] Johns Hopkins Sch Med, Dept Biomed Engn, Baltimore, MD 21205 USA
[4] Virginia Commonwealth Univ, Sch Engn, Dept Biomed Engn, Richmond, VA 23284 USA
[5] Virginia Commonwealth Univ, Dept Neurosurg, Med Coll Virginia, Richmond, VA 23298 USA
[6] Johns Hopkins Univ, Sch Med, Dept Neurosurg, Baltimore, MD 21205 USA
[7] Virginia Commonwealth Univ, Sch Engn, Dept Chem & Life Sci Engn, Richmond, VA 23284 USA
[8] Virginia Commonwealth Univ, 601 West Main St, Richmond, VA 23284 USA