1. U.S. Army Soldier and Biological Chemical Command, Natick Soldier Center, Natick, MA 01760-5018.
2. Corresponding author. E-mail: abarrett@natick-emh2.army.mil. Phone: 508-233- 4516. Fax: 508-233-4054.
3. Zymark Corp., Hopkinton, MA 01748.
4. Geo Centers, Inc., Natick, MA 01760.