1 Department of Diagnostic Imaging, Foothills Medical Center, University of Calgary, Calgary, AB T2N2T9, Canada; Department of Clinical Neurosciences, Foothills Medical Center, University of Calgary, Calgary, AB T2N2T9, Canada. Electronic address: mgoyal@ucalgary.ca.
2 Department of Neuroradiology, Clinic of Radiology and Nuclear Medicine, University Hospital Basel, Basel, Switzerland.
3 Department of Clinical Neurosciences, Foothills Medical Center, University of Calgary, Calgary, AB T2N2T9, Canada.
4 Department of Diagnostic Imaging, Foothills Medical Center, University of Calgary, Calgary, AB T2N2T9, Canada.