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(a) Male oral cancer (OC) morality rate for districts (per 100,000 population); (b) downscaled Male OC mortality rate in a grid of 1 km × 1 km cells (per 100,000 population); (c) variance in OC rate predicted by area-to-point (ATP) Poisson kriging (per 100,000 population)2; (d) population in each district.
