1 Department of Clinical Neurological Sciences, London Health Sciences Centre, Western University, London, ON, Canada.
2 Department Of Medical Imaging, London Health Sciences Centre, Western University, London, ON, Canada.
3 Department of Medicine, Division of Rheumatology, and Department of Epidemiology and Biostatistics, the University of Western Ontario, London, ON, Canada.
4 Lawson Health Research Institute, London, ON, Canada.