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    Cephalalgia. 1999 Oct;19(8):699-700.

    Unbalanced randomization influences placebo response: scientific versus ethical issues around the use of placebo in migraine trials.

    Diener HC, Dowson AJ, Ferrari M, Nappi G, Tfelt-Hansen P.

    Department of Neurology, University of Essen, Germany. h.diener@uni-essen.de

    PMID: 10570722 [PubMed - indexed for MEDLINE]

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