Fig. 2

Method of TN. a TN acupoints: ST36-one electrode was placed at ST36 and the other at 4 cm below ST36 along the same meridian; the posterior tibial nerve-one electrode was placed at about two fingers’ breadth up to the malleolus medialis and posterior to the tibia and the other at 4 cm above the first electrode. b Sham-TN acupoints: for ST36 was located at about 10 cm away from ST36 and to the lateral side of ST36 not on any meridian and for the posterior tibial nerve was located at about 10 cm away from and to the lateral side of the posterior tibial nerve not on any meridian