1. National Institutes of Health, Center for Information Technology, Image Sciences Laboratory, Bethesd
2. National Institutes of Health Clinical Center, Imaging Biomarkers and Computer-Aided Diagnosis Labor
3. National Cancer Institute, Molecular Imaging Program, Bethesda, Maryland
4. National Institutes of Health, Center for Information Technology, Computational Bioscience and Engin
5. National Cancer Institute, Center for Cancer Research, Urologic Oncology Branch, Bethesda, Maryland