Immediate effects of dry needling and acupuncture at distant points in chronic neck pain: results of a randomized, double-blind, sham-controlled crossover trial. - Irnich, D; Behrens, N; Gleditsch, J M; Stor, W; Schreiber, M A; Schops, P; Vickers, A J; Beyer, A (Pain, 2002)
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