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Canning S, Waterman M, Orsi N, Ayres J, Simpson N, Dye L. The efficacy of Hypericum perforatum (St John's wort) for the treatment of premenstrual syndrome: a randomized, double-blind, placebo-controlled trial. CNS Drugs. 2010 Mar;24(3):207–25. doi: 10.2165/11530120-000000000-00000. PMID: 20155996. |