1. Assistant Professor, Indian Institute of Technology, Kanpur, India; formerly, Research Associate, Dept. of Civil and Environmental Engineering, Univ. of South Carolina, Columbia, SC.
2. Mr. and Mrs. Irwin B. Kahn Professor and Chair, Dept. of Civil and Environmental Engineering, Univ. of South Carolina, 300 S. Main St., Columbia, SC 29208 (corresponding author).
3. Research Assistant Professor, Dept. of Civil and Environmental Engineering, Univ. of South Carolina, 300 S. Main St., Columbia, SC 29208.
4. Assistant Professor, Dept. of Internal Medicine, Univ. of South Carolina, Columbia, SC.