Egila, Hossam, Zeinab El-Mahdy, Ahmed Azab, Mohamed Abu-Hegazy, and Ayman Abdel-Naby. 2020. “Sodium Valproate Versus Propranolol in Chronic Migraine Prophylaxis”. International Neuropsychiatric Disease Journal 14 (3), 22-30. https://doi.org/10.9734/indj/2020/v14i330130.