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Gamma A, Frei E, Lehmann D, Pascual-Marqui RD, Hell D, Vollenweider FX.Gamma A, et al. Among authors: hell d.Neuroreport. 2000 Jan 17;11(1):157-62. doi: 10.1097/00001756-200001170-00031.Neuroreport. 2000.PMID: 10683849Clinical Trial.