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This study has very low validity....... They interviewed 79 lung cancer patients to find out who has done what...... Often times, they will identify they all did some thing that has nothing to do with causing the disease, e.g. they all had ketchup with their fries. This type of study is called a retrospective study and is low on the totem pole of epidemiology and biostats.
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kev { divinum est sedate dolorem }
"your friendly neighborhood critical care anesthesiologist"
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