1. Centre for Blood Research, University of British Columbia, Vancouver, British Columbia V6T 1Z3, Canada
2. Department of Pathology and Laboratory Medicine, University of British Columbia, Vancouver, British Columbia V6T 1Z3, Canada
3. Department of Urologic Sciences, University of British Columbia, Vancouver, British Columbia V5Z 1M9, Canada
4. Department of Chemistry, University of British Columbia, Vancouver, British Columbia V6T 1Z3, Canada