I never trust a single study's results to be an absolute. When subsequent studies confirm the original's results, then I will place some credence in the original'conclusions. I only consider the result of a single study to be a suggestion. The problem is that the news media is fond of taking the results of a study and publishing them as the final answer. Different methodologies, different study groups, and different protocols can lead to different results when investigating the same question.
Another problem is that we are again seeing instances where results are tainted or manipulated, yet conclusions are drawn and published.
And, yes, follow the money when appraising the results.
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