Experiment involving acupuncture and sham acupunture (as placebo) in the treatment of migraines.
group - a factor with levels control treatment
pain_free - a factor with levels no yes
Source
G. Allais et al. Ear acupuncture in the treatment of migraine attacks: a randomized trial on the efficacy of appropriate versus inappropriate acupoints. In: Neurological Sci. 32.1 (2011), pp. 173-175.
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