1. Military Nutrition Division, US Army Research Institute of Environmental Medicine, 10 General Greene Ave., Building 42, Natick, MA 01760, USA
2. Deployment Health Research Department, Naval Health Research Center, Ryne Rd., Building 329, San Diego, CA 92152, USA
3. Defense Centers for Public Health–Aberdeen, 8300 Ricketts Point Rd., Building E-2850, Aberdeen Proving Ground, MD 21010, USA