1. Researcher, SES Group & Associates LLC, 614 Biddle St., Chesapeake City, MD 21915 (corresponding author).
2. Student Researcher, Dept. of Cancer Biology, Wake Forest Univ., 1834 Wake Forest Rd., Winston-Salem, NC 27106.
3. Researcher, SES Group & Associates LLC, 614 Biddle St., Chesapeake City, MD 21915.
4. Team Leader, Turner-Fairbank Highway Research Center, 6300 Georgetown Pike, McLean, VA 22101.