Figure 4From: Incidence of oral cancer in relation to nickel and arsenic concentrations in farm soils of patients' residential areas in Taiwan Concentrations (mg/kg) of arsenic (A) and nickel (B) in farm soils. Areas with high arsenic are widespread on the west coast. Areas with high nickel are limited to two counties, Changhua on the west, and Hualian on the east coast.Back to article page