1. New York State Department of Health, Albany, New York 12237;
2. School of Public Health, University at Albany, Rensselaer, New York 12144
3. Harvard Medical School and Harvard Pilgrim Health Care Institute, Boston, Massachusetts 02215;
4. Brigham and Women's Hospital, Boston, Massachusetts 02115
5. Office of the Chief Operating Officer, Kaiser Foundation Hospitals, Kaiser Permanente, Pasadena, California 91188;