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In respect to the high degree of variation in the localization of acupuncture points, we suggest that the term 'acupuncture field' is more appropriate than 'acupuncture points' to describe the clinical reality; for the design of sham-controlled acupuncture trials, we recommend a minimum distance of 6 cm between verum and sham points on face, hands and feet, and up to 12 cm for all other parts of the body.
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Molsberger et al. (2012) studied this question.
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