1. Department of Radiology and Biomedical Imaging; University of California; San Francisco California USA
2. Center for Imaging of Neurodegenerative Diseases; Department of Veterans Affairs Medical Center; San Francisco California USA
3. Department of Radiation Physics; University of Gothenburg; Gothenburg Sweden
4. Department of Medical Physics and Biomedical Engineering; Sahlgrenska University Hospital; Gothenburg Sweden
5. Department of Radiology; Stanford University; Stanford California USA
6. Computer Assisted Clinical Medicine; Heidelberg University; Mannheim Heidelberg Germany