1. Department of Neurosurgery, Medical College of Wisconsin, Wauwatosa (B.L.B., M.A.M.).
2. Department of Exercise and Sport Science, University of North Carolina at Chapel Hill (Z.Y.K., A.C., S.W., J.D.D., K.M.G.).
3. Rush Alzheimer’s Disease Center, Chicago, IL (N.T.A.).
4. Datalys Center for Sports Injury Research and Prevention, Indianapolis, IN (A.C.).
5. Boston Children’s Hospital, MA (R.M., W.P.M.).
6. Psychological and Neurobehavioral Associates, Inc, State College, PA (R.J.E.).