1. National Engineering Laboratory for Resource Development of Endangered Crude Drugs in Northwest ChinaThe Key Laboratory of Medicinal Resources and Natural Pharmaceutical ChemistryThe Ministry of EducationCollege of Life SciencesShaanxi Normal University Xi'an Shaanxi 710119 P. R. China
2. Department of PharmacyThe First Affiliated Hospital of Zhengzhou University Zhengzhou Henan 450052 P. R. China