Direct stimulation of cytokines (IL1-β, TNF-α, IL-6, IFN-γ and GM-CSF) in whole blood. I. Comparison with isolated PBMC stimulation - de Groote, D; Zangerle, PF; Gevaert, Y; Fassotte, MF; Beguin, Y; Noizat-Pirenne, F; Gathy, R; Lopez, M; Dehart, I; Igot, D; Baudrihaye, M; Delacroix, D; Franchimont, P (Cytokine, 1992)