Our data suggest that there was no single geographical origin but that several populations contributed genes to the ancestral population that lead to today's humans. (scilifelab.se)
Our findings in a relatively severe clinical sample of children with ADHD, free of conduct disorders, are consistent with several population studies33 - 37 that have reported that ADHD or ADHD symptoms do not predict SUDs when controlling for conduct disorder or problems. (jamanetwork.com)
However, analyses of several population studies show that higher intake of DHA is linked with an increased risk of prostate cancer. (webmd.com)