Computed tomography brain scan utilization in patients with headache presenting to emergency departments: a multinational study

• Kevin ChuThe University of Queensland
• Anne‐Maree KellyThe University of Melbourne
• Gerben KeijzersGriffith University
• Frances B. KinnearThe University of Queensland
• Win Sen KuanNational University Hospital
• Colin Alexander GrahamChinese University of Hong Kong
• Sai͏̈d LaribiCentre Hospitalier Universitaire de Tours
• Tom RobertsUniversity of the West of England
• Mehmet Akif KaramercanGazi University
• Alejandro CardozoInstituto Neurológico de Colombia
• Sinan KamonaUniversity of Auckland
• Richard M. BodyManchester Royal Infirmary
• Daniel Edward HornerUniversity of Manchester
• Sharon KlimThe University of Melbourne
• Nathan J. BrownThe University of Queensland
• Tissa WijeratneThe University of Melbourne
• , on behalf of the HEAD study investigators