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[Requirements for quality of approved plant medicines].
Allemann C, Herren D, Badertscher KM. Allemann C, et al. Among authors: badertscher km. Ther Umsch. 2002 Jun;59(6):267-73. doi: 10.1024/0040-5930.59.6.267. Ther Umsch. 2002. PMID: 12125175 German.