University of Michigan, Ann Arbor, MI, University of Michigan Medical Center, Ann Arbor, MI, Georgetown University Hospital, Washington DC, Montefiore Medical Center, Albert Einstein College of Medicine, Bronx, NY, Uniformed Services University of the Health Sciences, Bethesda, MD, Mayo Clinic, Rochester, MN, Henry Ford Hospital, Detroit, MI, Hospital of the University of Pennsylvania, Philadelphia, PA, New England Deaconess Hospital, Boston, MA, University of California, San Francisco, CA, Mallinckrodt Institute of Radiology, St. Louis, MO, Bowman Gray School of Medicine, Winston-Salem, NC, Medical College of Wisconsin, Milwaukee, WI, Massachusetts General Hospital, Boston, MA; Massachusetts General Hospital, Boston, MA, William Beaumont Hospital, Royal Oak, MI, McMaster University, Canada, Freie Universit??t Berlin and Research Laboratories of Schering, Berlin, Federal Republic of Germany, The Mason Clinic, Seattle, WA, The Johns Hopkins Medical Institutions, Baltimore, MD, University of North Carolina, Chapel Hill, NC, Duke University Medical Center, Durham, NC, Massachusetts General Hospital, Boston, MA, Hahnemann University, Philadelphia, PA, University of Rochester Medical Center, Rochester, NY, Medical College of Virginia, Richmond, VA, Downstate Medical Center, New York University Medical Center, North Shore University Hospital, St. Luke's-Roosevelt Medical Center, Cornell University Medical College, Columbia University College of Physicians and Surgeons, New York, NY, Department of Radiology, Mayo Clinic, Rochester, MN, University of Iowa Hospitals and Clinics, Iowa City, IA, St. Vincent Hospital, Worcester, MA, New York University Medical Center, New York, NY, First Department of Medicine, School of Medicine, Chiba University, Japan, Mallinckrodt Institute of Radiology, St. Louis, MO; Mallinckrodt Institute of Radiology, St. Louis, MO, Ann Arbor, Clark, J., Munitz, H. A., Benjamin, S. B., Frager, J., Janower, M. L., Wolf, E. L., Frager, D., Kligerman, M., Brandt, L. J., Utz, J., Rubinsky, B., Baker, M. E., Kelvin, F. M., Thompson, W. M., Williams, D. M., Aisen, Alex M., Johnson, C. D., Herfkens, R., Kimura, K., Wolf, K. J., Ohto, M., Javors, B. R., Ebara, M., Weyman, P. J., Swantkowski, T. M., Sammon, J., Cho, S. R., Mauro, Matthew A., Shea, W., Bozymski, E. M., Demas, B., Charboneau, J. W., Hanelin, L. G., James, E., Haskin, P. H., Sheedy, P., Kastan, D., Stewart, E., Sugiura, N., Bernstein, L. H., Dachman, A. H., Stephens, D. H., Agha, Farooq P., Ell, S. R., Rubesin, S. E., Patrick, D. H., Jenkins, R., Cady, B., Ferrucci, J. T., Onik, G., Felix, R., Frost, R. A., Langer, J., Lawson, T., Halpert, R. D., Feczko, P. J., Lee, Marie E., Stark, D. D., Chen, Y. M., Skucas, J., Steele, G., Schwab, F. J., Martel, William, Jaffe, Mark H., Cho, Kyung J., Murakami, J., Listinsky, C., Jones, B., Laufer, I., Halpert, R., Kerlan, R., Wu, W. C., Gelfand, D. W., Miller, T., Teefey, S., Goldberg, H. I., Ormson, M. J., Grant, E. G., Ziessman, H., Silverman, P. M., Hohn, D., Zeman, R. K., Lichtenstein, J. E., Khettry, U., Kane, R., Ott, D. J., Somers, S., Lamping, D., Schroeder, K. W., Saini, S., Dodds, W., Stevenson, G., Turner, M. A., Charboneau, W., Choyke, P. L., Weinmann, H. -J., Darweesh, R., MacCarty, R. L., Clark, L. R., Hulnick, D. H., Reiman, T. H., Balfe, D. M., Schwab, R. E., Roemer, T., Bree, Robert L., McDermott, W., Ackerman, L., Nichols, J. B., Bradley, J. J., Wittenberg, J., Clouse, M., Messmer, J. M., Gilbert, J., Gudex, D., Hooyman, J. R., Glick, S. N., Carpenter, H. A., Carlson, H. C., Ni, X. Y., Teplick, S. K., Farman, J., Katz, J., Lu, C. C., Barloon, T., Franken, E. A., Balthazar, Emil J., Beneventano, T. C., Levine, M. S., Hamm, B., Bashist, B., Staab, E. V., Cooper, C., Megibow, A. J., University of Michigan, Ann Arbor, MI, University of Michigan Medical Center, Ann Arbor, MI, Georgetown University Hospital, Washington DC, Montefiore Medical Center, Albert Einstein College of Medicine, Bronx, NY, Uniformed Services University of the Health Sciences, Bethesda, MD, Mayo Clinic, Rochester, MN, Henry Ford Hospital, Detroit, MI, Hospital of the University of Pennsylvania, Philadelphia, PA, New England Deaconess Hospital, Boston, MA, University of California, San Francisco, CA, Mallinckrodt Institute of Radiology, St. Louis, MO, Bowman Gray School of Medicine, Winston-Salem, NC, Medical College of Wisconsin, Milwaukee, WI, Massachusetts General Hospital, Boston, MA; Massachusetts General Hospital, Boston, MA, William Beaumont Hospital, Royal Oak, MI, McMaster University, Canada, Freie Universit??t Berlin and Research Laboratories of Schering, Berlin, Federal Republic of Germany, The Mason Clinic, Seattle, WA, The Johns Hopkins Medical Institutions, Baltimore, MD, University of North Carolina, Chapel Hill, NC, Duke University Medical Center, Durham, NC, Massachusetts General Hospital, Boston, MA, Hahnemann University, Philadelphia, PA, University of Rochester Medical Center, Rochester, NY, Medical College of Virginia, Richmond, VA, Downstate Medical Center, New York University Medical Center, North Shore University Hospital, St. Luke's-Roosevelt Medical Center, Cornell University Medical College, Columbia University College of Physicians and Surgeons, New York, NY, Department of Radiology, Mayo Clinic, Rochester, MN, University of Iowa Hospitals and Clinics, Iowa City, IA, St. Vincent Hospital, Worcester, MA, New York University Medical Center, New York, NY, First Department of Medicine, School of Medicine, Chiba University, Japan, Mallinckrodt Institute of Radiology, St. Louis, MO; Mallinckrodt Institute of Radiology, St. Louis, MO, Ann Arbor, Clark, J., Munitz, H. A., Benjamin, S. B., Frager, J., Janower, M. L., Wolf, E. L., Frager, D., Kligerman, M., Brandt, L. J., Utz, J., Rubinsky, B., Baker, M. E., Kelvin, F. M., Thompson, W. M., Williams, D. M., Aisen, Alex M., Johnson, C. D., Herfkens, R., Kimura, K., Wolf, K. J., Ohto, M., Javors, B. R., Ebara, M., Weyman, P. J., Swantkowski, T. M., Sammon, J., Cho, S. R., Mauro, Matthew A., Shea, W., Bozymski, E. M., Demas, B., Charboneau, J. W., Hanelin, L. G., James, E., Haskin, P. H., Sheedy, P., Kastan, D., Stewart, E., Sugiura, N., Bernstein, L. H., Dachman, A. H., Stephens, D. H., Agha, Farooq P., Ell, S. R., Rubesin, S. E., Patrick, D. H., Jenkins, R., Cady, B., Ferrucci, J. T., Onik, G., Felix, R., Frost, R. A., Langer, J., Lawson, T., Halpert, R. D., Feczko, P. J., Lee, Marie E., Stark, D. D., Chen, Y. M., Skucas, J., Steele, G., Schwab, F. J., Martel, William, Jaffe, Mark H., Cho, Kyung J., Murakami, J., Listinsky, C., Jones, B., Laufer, I., Halpert, R., Kerlan, R., Wu, W. C., Gelfand, D. W., Miller, T., Teefey, S., Goldberg, H. I., Ormson, M. J., Grant, E. G., Ziessman, H., Silverman, P. M., Hohn, D., Zeman, R. K., Lichtenstein, J. E., Khettry, U., Kane, R., Ott, D. J., Somers, S., Lamping, D., Schroeder, K. W., Saini, S., Dodds, W., Stevenson, G., Turner, M. A., Charboneau, W., Choyke, P. L., Weinmann, H. -J., Darweesh, R., MacCarty, R. L., Clark, L. R., Hulnick, D. H., Reiman, T. H., Balfe, D. M., Schwab, R. E., Roemer, T., Bree, Robert L., McDermott, W., Ackerman, L., Nichols, J. B., Bradley, J. J., Wittenberg, J., Clouse, M., Messmer, J. M., Gilbert, J., Gudex, D., Hooyman, J. R., Glick, S. N., Carpenter, H. A., Carlson, H. C., Ni, X. Y., Teplick, S. K., Farman, J., Katz, J., Lu, C. C., Barloon, T., Franken, E. A., Balthazar, Emil J., Beneventano, T. C., Levine, M. S., Hamm, B., Bashist, B., Staab, E. V., Cooper, C., and Megibow, A. J.