1. Center for Research on Health Care, University of Pittsburgh, Pittsburgh, Pennsylvania, barnatoae@ upmc.edu
2. Center for the Evaluative Clinical Sciences, Dartmouth Medical School, Hanover, New Hampshire
3. Decision Research, Eugene, Oregon
4. Virginia Commonwealth University, Richmond, Virginia
5. Comprehensive Breast Program, Dartmouth-Hitchcock Medical Center, Lebanon, New Hampshire
6. Health Services Research Program, Massachusetts General Hospital, Boston, Massachusetts