From the MacColl Institute for Healthcare Innovation, Center for Health Studies, Group Health Cooperative, Seattle, Washington. This manuscript was supported under grant no. 0347984 to Group Health Cooperative from The Robert Wood Johnson Foundation. Reprints: Edward H. Wagner, MD, MPH, Center for Health Studies, 1730 Minor Avenue, Suite 1600, Seattle, WA 98101-1448. E-mail: [email protected].
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