[1] Texas A&M Univ, Coll Sci, College Stn, TX 77840 USA
[2] Texas A&M Univ, Coll Engn, College Stn, TX 77840 USA
[3] Univ Wisconsin, Dept Phys, Milwaukee, WI 53211 USA
[4] Texas A&M Univ, Dept Biomed Engn, College Stn, TX 77840 USA
[5] Baylor Univ, Coll Engn & Appl Sci, Waco, TX 76798 USA