Dose-dependent in vivo effect of Rhodiola and Echinacea on the mitogen-induced lymphocyte proliferation in mice - Skopińska-Rózewska, E; Sokolnicka, I; Siwicki, A K; Stankiewicz, W; Dabrowski, M P; Buchwald, W; Krajewska-Patan, A; Mielcarek, S; Mścisz, A; Furmanowa, M (Pol J Vet Sci, 2011)