1. S. M. Al-Khatib, R. M. Califf, V. Hasselblad, and J. H. Alexander are in the Department of Medicine, Duke Clinical Research Institute;
2. D. C. McCrory is in the Division of General Medicine;
3. J. Sugarman is in the Center for the Study of Medical Ethics and Humanities, Duke University Medical Center, Durham, NC 27710, USA.