Improvement of Urinary Retention Symptoms With Electroacupuncture Therapy

the investigators use stainless steel acupuncture needle, disposable : Huanqiu® 0.25 x 0.40 mm Electroacupuncture device : Hwato-SDZ V®, continuous wave, 2 Hz, for 30 minutes

"the investigators use the same device like true electroacupuncture group, but the acupuncture needle not puncture on the skin and only attached.~electroacupuncture device, with no electrical stimulation"