Ah ha! Like I said, JayMan is always right.https://twitter.com/degenrolf/status/895582358052552704 …
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There are some, but such studies are essentially impossible to really do (no way to remove confounds).
Just do it sibling study.
Then you get child-to-parent confounding. Like I said it's impossible to remove confounds.
Not at all. Check child parent congruence for sibs who differ in parental exposure. Did that already in a big Swedish study. @AmirSariaslan
How exactly would that work? @AmirSariaslan
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