1. Division of Heart and Vascular Diseases, National Heart, Lung, and Blood Institute, NIH, 6701 Rockledge Drive, Bethesda, MD
2. Laboratory of Cellular Carcinogenesis and Tumor Promotion, Center for Cancer Research, National Cancer Institute, NIH, 37 Convent Drive, Bethesda, MD
3. Bioqual Incorporated, 2501 Research Boulevard, Rockville, MD
4. Image Analysis Laboratory, National Cancer Institute, Frederick Cancer Research and Development Center, SAIC, Frederick, MD
5. Biometric Research Branch, Division of Cancer Treatment and Diagnosis, National Cancer Institute, NIH, Bethesda, MD