Medical Progress

From the Department of General Internal Medicine, Clinical Immunology and Infectious Diseases, Medical University of Innsbruck, Innsbruck, Austria (G.W.); and the Departments of Pathology and Medicine, Stanford University, Stanford, Calif. (L.T.G.). Address reprint requests to Dr. Weiss at the Department of General Internal Medicine, Clinical Immunology and Infectious Diseases, Medical University of Innsbruck, Anichstr. 35, A-6020 Innsbruck, Austria, or at [email protected].