From the Queen Elizabeth II Health Sciences Centre and Dalhousie University, Halifax, Nova Scotia, Canada.
Received for publication October 1, 2003; accepted December 13, 2003.
Reprints: Professor Albert D. Fraser, Pathology & Laboratory Medicine, Department of Pathology, Queen Elizabeth II Health Sciences Centre, Dalhousie University, 1278 Tower Road, Halifax, Nova Scotia B3H 2Y9, Canada (e-mail: [email protected]).