1. Department of Radiology, Second Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, Zhejiang 310009, P. R. China
2. College of Pharmaceutical Sciences, Zhejiang University, Hangzhou 310058, P. R. China
3. College of Pharmacy, Heilongjiang University of Chinese Medicine, Xiangfang District, Harbin, 150040, P. R. China