1. Acupuncture and Massage College, Beijing University of Chinese Medicine, Beijing 100029, P.R. China
2. Acupuncture and Massage Rehabilitation College, Yunnan University of Chinese Medicine, Kunming, Yunnan 650500, P.R. China
3. Acupuncture and Moxibustion Department, Zibo Hospital of Traditional Chinese Medicine of Shandong Province, Zibo, Shandong 255300, P.R. China