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In a Study of 62,641 Female Nurses the Amount of Selenium

Question 11

Multiple Choice

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. Which of the following applies to this study?


A) Randomized Experiment
B) Prospective Study
C) Placebo Control
D) Single Blind

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