1. Key Laboratory of Particle & Radiation Imaging, Ministry of Education, Department of Engineering Physics Tsinghua University Beijing 100084 P.R. China
2. Key Laboratory of Ministry of Education for Traditional Chinese Medicine Resource and Compound Prescription Hubei University of Chinese Medicine Wuhan 430065 P.R. China
3. China Pharmaceutical Preparation Section Huazhong University of Science and Technology Union Jiangbei Hospital/Wuhan Caidian People's Hospital Wuhan 430100 P.R. China