CT Head and C-Spine Study Group. Canadian CT Head Rule Study for patients with minor head injury: methodology for phase II (validation

Ian G. Stiell, MD, MSc*‡§ Howard Lesiuk, MD¶ George A. Wells, PhD# Douglas Coyle, MA# R. Douglas McKnight, MD¶¶ Robert Brison, MD, MPH‡‡ Catherine Clement, RN# Mary A. Eisenhauer, MDII II Gary H. Greenberg, MD‡ Iain MacPhail, MD, MHSc¶¶ Mark Reardon, MD‡ James Worthington, MBBS‡II Richard Verbeek, MD§§ Brian Rowe, MD, MSc** Daniel Cass, MD§§ Jonathan Dreyer, MDII II Brian Holroyd, MD, FRCPC** Laurie Morrison, MD§§ Michael Schull, MD, MSc‡§§ Andreas Laupacis, MD, MSc§§ For the Canadian CT Head and C-Spine Study Group From the Ottawa Health Research Institute, Ottawa, Ontario, Canada*; the Division of Emergency Medicine,‡ Department of Medicine,§ Department of Epidemiology and Community Medicine,II Division of Neurosurgery,¶ Clinical Epidemiology Unit, University of Ottawa, Ottawa, Ontario, Canada#; Division of Emergency Medicine, University of Alberta, Edmonton, Alberta, Canada**; Department of Emergency Medicine, Queen’s University, Kingston, Ontario, Canada‡‡; Division of Emergency Medicine, University of Toronto, Toronto, Ontario, Canada§§; Division of Emergency Medicine, University of Western Ontario, London, Ontario, CanadaII II; and the Division of Emergency Medicine, University of British Columbia, Vancouver, British Columbia, Canada.¶¶