1. From the Department of Internal Medicine, University of Michigan, Ann Arbor (J.L.G., E.R.B., B.K.N.)
2. Department of Internal Medicine, Boston University School of Medicine, Boston University, MA (A.K.J.)
3. Department of Internal Medicine, Duke University, Durham, NC (D.H., K.C., R.B., M.R.)
4. Department of Internal Medicine, UCLA Medical Center, Los Angeles, CA (W.F.)
5. Department of Emergency Medicine, Geisinger Medical Center, Mechanicsville, PA (D.F.K.)
6. and Zoll Medical, Chelmsford, MA (G.M.).