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Given the complications of rigorously controlling the variables sex means different things to different people Grunberg added that it would be "difficult to do a true controlled experiment" investigating the question, but offered a tentative hypothesis

ALK gene rearrangements: a new therapeutic target in a molecularly defined subset of non-small cell lung cancer

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More than 60 million Americans experience heartburn at least once a month, and at least 15 million suffer from it daily

The null hypothesis in these studies would be that chewing tobacco has no effect on cancer, and the alternative hypothesis would be that there is a causal link between smokeless tobacco and oral cancer