6Zhang RX, Lao L, Wang L, et al. Involvement of opioid receptors in electroacupuncture-produced anti-hypemlgesia in rats with peripheral inflammation[J]. Brain Res, 2004, 1020(1-2) : 12 17.
7Kim HY, Wang J, Lee I, et al. Electroacupuncture suppresses capsaicin -induced secondary hyperalgesia through an endogenous spinal opioid mechanism[J]. Pain, 2009, 145 (3) : 332-340.
