Mark B. Johnson a,*, Laszlo Mechtler b, Bina Ali a, David Swedler a, Tara Kelley-Baker c
from a Pacific Institute for Research and Evaluation (PIRE), 11720 Beltsville Drive, Suite 900, Calverton, MD 20705, USA and b Dent Neurologic Institute, 3980 Sheridan Drive, Amherst, NY 14226, USA and c AAA Foundation for Traffic Safety, 607 14th Street, NW, Suite 201, Washington, DC 20005-2000, USA