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    Randomized trial vs. observational study of acupuncture for migraine found that patient characteristics differed but outcomes were similar . 
    Journal of Clinical Epidemiology , Volume 60 , Issue 3 , Pages 280 - 287
    K . Linde , A . Streng , A . Hoppe , W . Weidenhammer , S . Wagenpfeil , D . Melchart
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