Effects of an Orally Applied Aqueous-Ethanolic Extract of a Mixture of Thujae occidentalis Herba, Baptisiae tinctoriae Radix, Echinaceae purpureae Radix and Echinaceae pallidae Radix on Antibody Response against Sheep Red Blood Cells in Mice - Bodinet, Cornelia; Freudenstein, Johannes (Planta Medica, 1999)