1. Cornell SIMS Laboratory; Department of Biomedical Engineering; Cornell University; Ithaca New York U.S.A.
2. Department of Pathology; The Ohio State University; Columbus Ohio U.S.A.
3. Department of Radiology; The University of Tennessee; Knoxville Tennessee U.S.A.
4. Department of Chemistry; The University of Tennessee; Knoxville Tennessee U.S.A.