Modulatory effects of Echinacea purpurea extracts on human dendritic cells: A cell- and gene-based study - Wang, C Y; Chiao, M T; Yen, P J; Huang, W C; Hou, C C; Chien, S C; Yeh, K C; Yang, W C; Shyur, L F; Yang, N S (Genomics, 2006)