Untargeted metabolomics reveals dose-response characteristics for effect of rhubarb in a rat model of cholestasis oleh Cong-En eZhang, Cong-En eZhang, Ming eNiu, Rui-yu eLi, Rui-yu eLi, Wu-Wen eFeng, Wu-Wen eFeng, Xiao eMa, Xiao eMa, Qin eDong, Qin eDong, Zhi-jie eMa, Guang-Quan eLi, Guang-Quan eLi, Ya-Kun eMeng, Ya eWang, Ping eYin, Lan-Zhi eHe, Yu-Meng eLi, Peng eTan, Yan-ling eZhao, Jia-Bo eWang, Xiao-ping eDong, Xiao-he eXiao