The rest of the story is that not only is CDC failing to disclose the important conflicts of interest of the 2014 Surgeon General's report authors, but OSH is involved in a cover-up. Apparently, OSH has deliberately chosen to hide these conflicts of interest from the public.

A third major advantage of a clinical trial is that conditions are controlled as carefully as possible, minimizing potential biases. Both sampling and measurement bias are greatly reduced, if not eliminated. In contrast, survey studies are generally subject to significant sampling and measurement bias.

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