1. Center for Imaging Science, Johns Hopkins University, Baltimore, Maryland.
2. Institute for Computational Medicine, Johns Hopkins University, Baltimore, Maryland.
3. Whitaker Biomedical Engineering Institute, Johns Hopkins University, Baltimore, Maryland.
4. Russell H. Morgan Department of Radiology and Radiological Sciences, Johns Hopkins University School of Medicine, Baltimore, Maryland.
5. Department of Neurobiology, Yale University School of Medicine, New Haven, Connecticut.