1. Centre for Headache, Women's College Hospital University of Toronto Toronto Ontario Canada
2. Wasser Pain Medicine Clinic, Mount Sinai Hospital University of Toronto Toronto Ontario Canada
3. Department of Psychiatry Women’s College Hospital and University of Toronto Toronto Ontario Canada
4. Department of Mental Health VA Greater Los Angeles Healthcare System Los Angeles California USA
5. Department of Psychiatry and Biobehavioral Sciences David Geffen School of Medicine at UCLA Los Angeles California USA
6. Division of Neurology, Hospital for Sick Children University of Toronto Toronto Ontario Canada
7. Department of Pediatrics, Division of Neurology, Children's Hospital, London Health Sciences Center University of Western Ontario London Ontario Canada