1. From the Department of Laboratory Medicine, Credit Valley Hospital, Mississauga, Ontario (Dr Srigley); the Department of Pathology, Emory University Hospital, Atlanta, Ga (Dr Amin); the Department of Pathology, The Johns Hopkins Hospital, Baltimore, Md (Dr Epstein); the Department of Pathology, Wayne State University School of Medicine, Detroit, Mich (Dr Grignon); the Department of Pathology, Was