Figure 3From: Design of a randomised acupuncture trial on functional neck/shoulder stiffness with two placebo controls Double-blind needle assembly and extra guide tube. A: Extra guide tube. Diameter of upper part of extra guide tube is smaller than that of guide tube needle assembly. B: Needle assembly. C: Needle assembly covered with extra guide tube. (a) indicates insertion depth with tapping-in method. (b) indicates whole insertion depth.Back to article page