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Means and standard deviations of surface roughness (Ra) (in nm) and Vickers microhardness for the Ti-6Al-4V alloys with a smooth surface and those etched with acid in SBF with different concentrations of dextrose (DEX) and lipopolysaccharide (LPS), alone or in combination (DEXLPS). * Denotes significant correlation at the 0.05 level.
