[1] Univ Calif San Diego, Dept Bioengn, La Jolla, CA 92093 USA
[2] Univ Calif San Diego, Mat Sci & Engn Program, La Jolla, CA 92093 USA
[3] Southeast Univ, Sch Chem & Chem Engn, Nanjing 210018, Jiangsu, Peoples R China
[4] Sungkyunkwan Univ, Sch Med, Dept Orthopaed Surg, Seoul 135710, South Korea