[1] Virginia Commonwealth Univ, Dept Psychol, 806 W Franklin St,Box 842018, Richmond, VA 23284 USA
[2] East Carolina Univ, Dept Psychol, Greenville, NC USA
[3] East Carolina Univ, Dept Pediat, Greenville, NC USA
[4] Univ Nebraska Med Ctr, Monroe Meyer Inst Genet & Rehabil, Omaha, NE USA
[5] Med Univ South Carolina, Div Biobehav Med, Dept Psychiat, Charleston, SC USA
[6] Univ Mississippi, Med Ctr, Dept Family Med, Jackson, MS 39216 USA
[7] Univ Pittsburgh, Med Ctr, Dept Orthopaed Surg, Sports Med Concuss Program, Pittsburgh, PA USA