1 Division of Neurology (Micieli), University of Toronto; Division of Neurology (Robblee), Krembil Neuroscience Centre Headache Clinic, Toronto, Ont.
2 Division of Neurology (Micieli), University of Toronto; Division of Neurology (Robblee), Krembil Neuroscience Centre Headache Clinic, Toronto, Ont. robblee@uhn.ca.