Let's get serious. Is there a twin control study for smoking and lung cancer?
Twin control for eating and obesity. https://helda.helsinki.fi/bitstream/handle/10138/42421/bogl_dissertation.pdf?sequence=1 …
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Various activities including physical and obesity. Twin control. https://helda.helsinki.fi/bitstream/handle/10138/20360/leisurea.pdf?sequence=1 …
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Obesity and cancer risk. http://onlinelibrary.wiley.com/doi/10.1002/ijc.11266/full … I could go on. Don't be so stubborn. :)
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I'm aware of large twin controls out of Sweden. Nil effect. Last one is standard correlational and is worthless. Other...
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