Corrigendum: Are Cerebral White Matter Lesions Related to the Presence of Bilateral Internal Carotid Artery Stenosis or to the Length of Stenosis Among Patients With Ischemic Cerebrovascular Events? - Elhfnawy, Ahmed Mohamed; Volkmann, Jens; Schliesser, Mira; Fluri, Felix (Frontiers in Neurology, 2019)