Hi, all. I thought some might find this NEJM article and a USA Today write-up on it interesting. http://yourlife.usatoday.com/fitness-food/exercise/story/2011-10-19/Study-B… Thanks, Renee Autumn Ray, AICP Senior Associate ICF International 3 Corporate Square NE, Suite 370 Atlanta, GA 30329 (404) 321-3211 rray(a)icfi.com