1. Department of Radiology University of Texas Health Science Center San Antonio Texas USA
2. Diabetes Division UTHSCSA San Antonio Texas USA
3. Division of Cardiology UTHSCSA and South Texas Veterans Health Care System San Antonio Texas USA
4. Consiglio Nazionale delle Richerche, Pisa, Italy; Diabetes Division UTHSCSA San Antonio Texas USA
5. Diabetes Institute and South Texas Veterans Health Care System San Antonio Texas USA