Effect of cobalt and chromium ions on MMP-1, TIMP-1, and TNF-α gene expression in human U937 macrophages: A role for tyrosine kinases - Luo, Li; Petit, Alain; Antoniou, John; Zukor, David J.; Huk, Olga L.; Liu, Roger C.W.; Winnik, Françoise M.; Mwale, Fackson (Biomaterials, 2005)