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The selection of IVs must meet three criteria for valid instrumental variable analysis: 1) The genetic variant is highly correlated with the exposure

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Note(s): [A] The term country, used interchangeably with economy, does not imply political independence but refers to any territory for which authorities report separate social or economic statistics.

A three-week traditional altitude training increases hemoglobin mass and red cell volume in elite biathlon athletes

and we are all at pains, in one way or another, to buy ourselves back