[1] Univ Calif San Diego, Dept Bioengn, La Jolla, CA 92093 USA
[2] Univ Calif San Diego, Inst Engn Med, La Jolla, CA 92093 USA
[3] Singapore MIT Alliance Res & Technol, BioSyst & Micromech, Singapore 138602, Singapore
[4] Univ Illinois, Dept Bioengn, Champaign, IL 61801 USA
[5] Sanford Burnham Med Res Inst, La Jolla, CA 92037 USA
[6] Shanghai Jiao Tong Univ, Inst Mechanobiol & Med Engn, Shanghai 200240, Peoples R China