The effect of standardized Echinacea purpurea extract on rat cytochrome P450 expression level - Mrozikiewicz, P M; Bogacz, A; Karasiewicz, M; Mikołajczak, P L; Ozarowski, M; Seremak-Mrozikiewicz, A; Czerny, B; Bobkiewicz-Kozłowska, T; Grześkowiak, E (Phytomedicine, 2010)