[1] Emory Univ, Georgia Inst Technol, Wallace H Coulter Dept Biomed Engn, Atlanta, GA 30332 USA
[2] Georgia Inst Technol, George W Woodruff Sch Mech Engn, Atlanta, GA 30313 USA
[3] Imperial Coll London, Dept Bioengn, London SW7 2AZ, England
[4] Univ Texas Austin, Dept Biomed Engn, Austin, TX 78712 USA
[5] Univ Oregon, Phil & Penny Knight Campus Accelerating Sci Impac, Eugene, OR 97403 USA
[6] MIT, Dept Biol Engn & Mech Engn, Cambridge, MA 02139 USA