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  1. Excluded Studies - Acute Treatments for Episodic Migraine - NCBI Bookshelf 
    https://www.ncbi.nlm.nih.gov/books/NBK566247
    ... Jaberi AR, Sobhani Z, et al. Efficacy of Anise (Pimpinella anisum L.) oil for migraine headache: A pilot ... M, et al. From investigational product to active reference: evolution of oral sumatriptan efficacy versus placebo for ...