1. Department of Pathology, The Johns Hopkins Medical Institutions,1 and
2. Department of Pathology, University of Maryland School of Medicine,2 Baltimore, Maryland;
3. St. Mary's-Duluth Clinic Medical Center, Duluth, Minnesota3; and
4. Department of Pathology4 and
5. Division of Infectious Diseases, Department of Medicine,5 New York Medical College, Valhalla, New York