Differentiation of acupuncture and non-acupuncture points by difference of associated opioids in the spinal cord in production of analgesia by acupuncture and non-acupuncture point stimulation, and relations between sodium and those opioids. - Takeshige,C..; Luo,C..P..; Hishida,F..; Igarashi,O.. (Acupunct. Electro-Ther. Res., 1990)