Affiliation: | 1. Department of Kinesiology, University of Massachusetts, Amherst, MA 01003‐9258;2. Department of Biostatistics, University of Massachusetts, Amherst, MA 01003‐9258;3. Department of Kinesiology, Michigan State University, East Lansing, MI 48824;4. Gramercy Research Group, Winston‐Salem, NC 27106 |