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Saponins of the Rhizome of Panax japonicus C. A. Meyer var. major (Burk.)Wu et Feng Collected in Qinling Mountain (Shaanxi) HPLC determination of chikusetsusaponin IVa in Rhizoma PanacisMajoris from different producing areas Affection of different preparations on the content of toxic constituents in traditional Chinese medicines, examplified with Caulis Aristolochiae Manshuriensis