Document Type: Research Article
Affiliations: 1: Community Health Sciences, UCLA School of Public Health, Los Angeles, CA. 2: School of Health Administration and Policy, Arizona State University, Tempe, AZ. 3: Biostatistics and Epidemiology, University of South Carolina, School of Public Health, Columbia, SC. 4: Rand Corporation, Santa Monica, CA.
Publication date: May 1, 1999