UPLC and HPLC analysis on contents of astilbin and engeletin in dong medicine "sunl gaems" of Guizhou origin by QAMS Simultaneous assay of epimedin A epimedin B,epimedin C and icariin in herba epimedii by QAMS Study on quality control of Houttuynia Cordata, a traditional Chinese medicine by fingerprint combined with quantitative analysis of multi-components by single marker