Effects of chemically characterized fractions from aerial parts of Echinacea purpurea and E. angustifolia on myelopoiesis in rats - Ramasahayam, S; Baraka, H N; Abdel Bar, F M; Abuasal, B S; Widrlechner, M P; Sayed, K A; Meyer, S A (Planta Med, 2011)