1. Division of Advanced Diagnostics (Y.-t.A.C., W.I., W.S., Z.E.S., T.J.), Toronto General Research Institute, University Health Network, Toronto, Canada M5G 1L7;
2. Department of Physiology (Y.-t.A.C., T.J.), University of Toronto, Toronto, Canada M5S 1A8;
3. Institute of Medical Science (W.I., T.J.), University of Toronto, Canada;
4. Fox Chase Cancer Center (J.C.), Philadelphia, Pennsylvania 19111