1. School of Medicine of Southeast University, Nanjing, Jiangsu, P.R. China,
2. School of Medicine of Henan Polytechnic University, Jiaozuo, Henan, P.R. China, and
3. Department of Ultrasound in Medicine, The First Affiliated Hospitial (Jiangsu Province of TCM), Nanjing University of Chinese Medicine, Nanjing, Jiangsu, P.R. China