When You Hear Hoof Beats: Four Principles for Separating Zebras From Horses

From the Northwest Regional Faculty Development Center (CSS), Veterans Administration Medical Center, Boise, Idaho; and the Division of General Internal Medicine (CSS, DSP) and Department of Medical Education (CSS), University of Washington, Seattle. Address reprint requests to C. Scott Smith, MD, Department of Medicine (111), VA Medical Center, 500 W Fort St, Boise, ID 83702.

From the Northwest Regional Faculty Development Center (CSS), Veterans Administration Medical Center, Boise, Idaho; and the Division of General Internal Medicine (CSS, DSP) and Department of Medical Education (CSS), University of Washington, Seattle. Address reprint requests to C. Scott Smith, MD, Department of Medicine (111), VA Medical Center, 500 W Fort St, Boise, ID 83702.