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The SEM micrographs of HA scaffolds with the same d/s ratio of interconnecting window diameter to macro-pore size but different pore sizes after the sugar spheres templates heated at 70 °C: (A) 500–650 µm for 3 min, (B) 750–900 µm for 5 min, (C) 1100–1250 µm for 8 min and (D) surface topography on the macro-pores wall
