Treating refractory migraines in multiple sclerosis patients: a single-arm interventional study on ultrasound-guided occipital nerve block. - Salah, Nouran Mohamed; Abdallah, Rana Magdi; Farag, Sherien Mohamed; Khalil, Salma Hamed; Abdelaziz, Azza Abdelnasser; Elaidy, Doaa Abdallah (Egyptian Journal of Neurology, Psychiatry & Neurosurgery, 2025)