Mark J. DeHaven, PhD, Irby B. Hunter, MD, Laura Wilder, MLS, James W. Walton, DO and Jarett Berry, MD

Mark J. DeHaven, Irby B. Hunter, Laura Wilder, and Jarett Berry are with the University of Texas Southwestern Medical Center at Dallas. James W. Walton is with the Baylor Health Care System, Dallas.

Correspondence: Requests for reprints should be addressed to Mark J. DeHaven, PhD, Division of Community Medicine, Department of Family Practice and Community Medicine, University of Texas Southwestern Medical Center at Dallas, 6263 Harry Hines Blvd, Dallas, TX 75390-9067 (e-mail: mark.dehaven@utsouthwestern.edu