Chaves, F., Chacón, M., Badilla, B., & Arévalo, C. (2007). Effect of Echinacea purpurea (Asteraceae) aqueous extract on antibody response to Bothrops asper venom and immune cell response. Revista De Biología Tropical, 55(1), 113–119. https://doi.org/10.15517/rbt.v55i1.6061