Fig. 3From: Wrist-ankle acupuncture (WAA) for primary dysmenorrhea (PD) of young females: study protocol for a randomized controlled trialWAA needle & Sham acupuncture needle. WAA needle is the disposable sterile needle (0.25Â mm in diameter and 25Â mm in length, Suzhou Medical Appliance Factory, Jiangsu Province, China), sham acupuncture needle is also used the same model needle (0.25Â mm in diameter and 25Â mm in length, Suzhou Medical Appliance Factory, Jiangsu Province, China), while the tip and most body was cut off and blunted with only 2-3Â mm of the needle body remainedBack to article page