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Public Health 82 , 3740 (1992)

The distribution and success of reproduction of the species is heavily tied to their environment
Accordingly, significant characteristic information, i.e., sex, handedness, research sites, BMI, total intracranial volume (TIV), socioeconomic score, negative life events and IQ, were regressed out as covariates in the following analyses

They pointed out that none of the studies were considered to have a low risk of bias
