1. Brigham and Women's Hospital and Harvard Medical School; Boston Massachusetts
2. University of California; San Francisco
3. Boston University School of Medicine and Quantitative Imaging Center, Boston, Massachusetts, and University of Erlangen-Nuremberg; Erlangen Germany
4. Boston University School of Medicine and Quantitative Imaging Center; Boston Massachusetts
5. University of Arizona College of Medicine; Tucson
6. Duke University School of Medicine; Durham North Carolina
7. Royal North Shore Hospital, Kolling Institute of Medical Research, and University of Sydney; New South Wales, Sydney Australia