1. Ellen and Martin Prosserman Centre for Neuromuscular Diseases, Division of Neurology, Department of Medicine, University Health Network; University of Toronto; Toronto General Hospital, 200 Elizabeth Street, Room 5 EB 309 Toronto Canada
2. Department of Neurology, King Khalid University Hospital; King Saud University; Saudi Arabia
3. Department of Neurology, King Fahad Hospital of the University; University of Dammam; Saudi Arabia
4. Division of Endocrinology and Metabolism, Department of Medicine, Mount Sinai, Hospital and Lunenfeld Tanenbaum Research Institute; University of Toronto; Toronto Canada