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A case-control study suggesting that dual e-cigarette users and conventional tobacco smokers have an increased risk of developing lung cancer compared to smokers alone implying that e-cigarettes are not harmless as a smoking cessation aid

Pearson is Associate Dean of Student Services and Assessment, a professor in the College of Education and Human Development at the University of North Dakota (www.und.edu) and teaches Social Studies Methods in the Department of Teaching, Leadership and Professional Practices

Your dentist handles the procedure carefully, and you protect the area once you're home

The task outcome is span score and this is calculated as the average of the last three correctly completed trials