Downbeat Nystagmus: Aetiology and Comorbidity in 117 PatientsJNNP 79:672-677, Wagner,J.N.,et al, 2008
Causative Factors and Epidemiology of Bilateral Vestibulopathy in 255 PatientsAnn Neurol 61:524-532, Zingler,V.C.,et al, 2007