1. Department of Pharmacy Guilin Medical University No. 109 Huancheng Road Guilin 541004 P.R. China
2. Department of Public Health Guilin Medical University No. 109 Huancheng Road Guilin 541004 P.R. China
3. Department of Pharmacy Qinghai Provincial People's Hospital Xining Qinghai 810007 Qinghai Province, China
4. Department of Pharmacy Guangxi University of Chinese Medicine No. 13 Wuhe Road Nanning 530200 PR China