1. From the Department of Pathology and Laboratory Medicine, MedStar Washington Hospital Center, Washington, DC (Dr Alcorn); the Department of Pathology, Northwestern University, Chicago, Illinois (Dr Ramsey); Biostatistics, College of American Pathologists, Northfield, Illinois (Ms Souers); and the Department of Pathology, University of Utah, Salt Lake City (Dr Lehman). Dr Alcorn is now at Medical