| http://www.w3.org/ns/prov#value | - The subjects were told that two different types of needles were used but were unaware of one of them being a non-penetrating needle.Subjects were blinded to the acupuncture and NPSA needles by placing a plastic ring over the acupuncture point and fixing it with a plaster (Durapore Surgical Tape, 3???M, Minn, USA).
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