1. Hunan Provincial Key Laboratory of Cytochemistry, School of Chemistry and Food Engineering, Changsha University of Science and Technology, Changsha 410114, P. R. China
2. Key Laboratory of Chemical Biology & Traditional Chinese Medicine Research, Ministry of Education, College of Chemistry and Chemical Engineering, Hunan Normal University, Changsha 410081, P. R. China
3. Department of Ultrasound Diagnosis, Second Xiangya Hospital, Central South University, Changsha 410011, P. R. China