Hagopian Amy, Spigner Clarence, Gorstein Jonathan L, Mercer Mary Anne, Pfeiffer James, Frey Sarah, Benjamin Lillian, Gloyd Stephen
University of Washington, Department of Health Services, School of Public Health and Community Medicine, Seattle, WA 98105, USA.
Public Health Rep. 2008 May-Jun;123(3):408-14. doi: 10.1177/003335490812300325.