1. From School of Public Health and Community Medicine (M.G., N.Z.), The University of New South Wales, Australia; the Centre for Research, Evidence Management and Surveillance (M.G.), Division of Population Health, Sydney South West Area Health Service, NSW, Australia; The Northern Beaches Stroke Service (J.W.), Sydney, NSW, Australia; Sydney South West Clinical School, The University of New South Wales and Liverpool Health Service, Liverpool, NSW, Australia.