Validation of brain parenchyma sonography as a marker of neurodegeneration in multiple sclerosis. - Kishk, Nirmeen A.; Hamdy, Sherif; Amer, Hanan; Shalaby, Nevin M.; Othman, Alshimaa S.; Mohammad, Mohammad Edrees (Egyptian Journal of Neurology, Psychiatry & Neurosurgery, 2023)