You are planning a prospective study to try to prove a cause and effect relationship between dipping snuff and throat cancer. First, you identify subjects who regularly dip snuff and who are free of any signs of throat cancer. Next, you need to identify subjects who

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You are planning a prospective study to try to prove a cause and effect relationship between dipping snuff and throat cancer. First, you identify subjects who regularly dip snuff and who are free of any signs of throat cancer. Next, you need to identify subjects who






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