1. Donald W. Reynolds Department of Geriatric Medicine, Reynolds Oklahoma Center on Aging, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma, USA
2. Department of Physiology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma, USA
3. Department of Medical Physics and Informatics, Faculty of Medicine and Faculty of Science and Informatics, University of Szeged, Szeged, Hungary
4. Oklahoma Medical Research Foundation, Department of Pathology, Advanced Magnetic Resonance Center, Oklahoma City, Oklahoma, USA
5. The Peggy and Charles Stephenson Cancer Center, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma, USA
6. Department of Neurosurgery, Szentagothai Research Center, University of Pecs, Pecs, Hungary