1. From the Department of Pathology and Area Laboratory Services, Walter Reed National Military Medical Center, Bethesda, Maryland (Dr Crothers); the Pathology Cytology Laboratory, Mount Zion Medical Center, University of California, San Francisco (Dr Darragh); the Department of Pathology, Massachusetts General Hospital, Boston (Drs Tambouret and Wilbur); the Department of Cytopathology, Northwester