作者单位:Univ Calif San Diego, Mech & Aerosp Engn Dept, La Jolla, CA 92093 USA[1]Univ Complutense Madrid, Hosp Gen Univ Gregorio Maranon, Inst Invest Sanitaria Gregorio Maranon[2]San Diego State Univ, Bioengn Program, 5500 Campanile Dr, San Diego, CA 92182 USA[3]