Video head impulse testing to differentiate vestibular neuritis from posterior circulation stroke in the emergency department: a prospective observational study oleh Dennis Cordato, Cecilia Cappelen-Smith, Christopher Blair, Zeljka Calic, Paul M Middleton, Angelos Sharobeam, Miriam Welgampola, Abhay Venkat, James Orton Thomas, Nese Ozalp, Peter Wyllie