1. Res. Assoc., Dept. of Mech. Engrg., Dept. of Biomedical Engrg., Univ. of Akron, Akron, OH 44325-0302; corresponding author.
2. Res. Assoc., Dept. of Mech. Engrg., Dept. of Biomedical Engrg., Univ. of Akron, Akron, OH.
3. Assoc. Prof., Dept. of Mech. Engrg., Dept. of Biomedical Engrg., Univ. of Akron, Akron, OH.