Pharmacological and behavioral investigation of putative self-medicative plants in Budongo chimpanzee diets by Freymann, E, Carvalho, S, Garbe, LA, Dwi Ghazhelia, D, Hobaiter, C, Huffman, MA, Muhumuza, G, Schulz, L, Sempebwa, D, Wald, F, Yikii, ER, Zuberbühler, K, Schultz, F