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In a study of 62,641 female nurses the amount of selenium in toenail clippings was measured, and then they were followed for a number of

In a study of 62,641 female nurses the amount of selenium in toenail clippings was measured, and then they

were followed for a number of years to determine the risk of cancer. What kind of this study is? A. Randomized Experiment B. Prospective study C. Placebo Control D. Single Blind E. None of the above

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