1. Neuroimaging Laboratory, Department of Radiology; University of Pittsburgh; PA; USA
2. Center for Magnetic Resonance Research, Departments of Radiology and Neurosurgery; University of Minnesota; Minneapolis; MN; USA
3. Hoglund Brain Imaging Center, Department of Molecular and Integrative Physiology; University of Kansas Medical Center; Kansas City; KS; USA
4. Imaging Department; Merck Research Laboratories, Merck Pharmaceuticals; West Point; PA; USA