The Comparative Health Outcomes, Policy, and Economics (CHOICE) Institute, University of Washington, 1959 NE Pacific Street, H-375T, Box 357630, Seattle, WA, 98195-7630, USA. Department of Health Services, University of Washington, Seattle, WA, USA. Division of Public Health Sciences and Hutchinson Institute for Cancer Outcomes Research, Fred Hutchinson Cancer Research Center, Seattle, WA, USA. Department of Pediatrics, University of Washington and Clinical Research Division, Fred Hutchinson Cancer Research Center, Seattle, WA, USA. Department of Pharmacy, University of Washington, Seattle, WA, USA. The Comparative Health Outcomes, Policy, and Economics (CHOICE) Institute, University of Washington, 1959 NE Pacific Street, H-375T, Box 357630, Seattle, WA, 98195-7630, USA. bdevine@uw.edu. Department of Health Services, University of Washington, Seattle, WA, USA. bdevine@uw.edu.