1. Peggy A. Hannon, Kristen Hammerback, Marlana J. Kohn, Christine M. Kava, Amanda T. Parrish, Claire Allen, Caitlin Mayotte, and Jeffrey R. Harris are with the Department of Health Services, University of Washington, Seattle. Kwun C. Gary Chan is with the Department of Biostatistics, University of Washington, Seattle. Christian D. Helfrich is with VA Puget Sound Health Care System, Seattle, WA. Shirley A. Beresford is with the Department of Epidemiology, University of Washington, Seattle.