1. From the Department of Pathology & Laboratory Medicine, The University of British Columbia, Vancouver, BC, Canada.
2. Reprints: Dagmar K. Kalousek, MD, The University of British Columbia, Department of Pathology & Laboratory Medicine, British Columbia‘s Children's & Women's Hospital, 4480 Oak St, Vancouver, BC, Canada V6H 3V4 (dkalousek@cw.bc.ca).