Headache 2021 Juil 29;61(7):1140-1141. doi: 10.1111/head.14179. Epub 2021 Jul 29. Sylvain Redon, Marion Beltramone, Anne Donnet No abstract available PMID: 34325485 DOI: 10.1111/head.14179 Visual aura without headache as a pre-cluster symptom in episodic cluster headache: A report of two cases
