Strontium and antimony serum levels in healthy individuals living in high- and low-risk areas of esophageal cancer.

6 , 7 Nevertheless, esophageal cancer has declined to less than half over the past thirty years, but there is an increasing trend of breast cancer in Golestan Province. 7 , 8 Strontium is the fifteenth abundant element on the earth that includes 0.02 to 0.03 percent of the earth's crust.

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