In a study of 62,641 female nurses the amount of selenium in toenail clippings was measured, and
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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 years to determine the risk of cancer. Circle all terms in the list below that apply. Randomized Experiment Observational Study Prospective Study Double Blind Retrospective Study Single Blind Placebo Control
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