Meta-analysis demonstrated no significant effect on overall cognition (A) compared to placebo (Effect size (ES) = ?0.057, 95% CI = ?0.16 to 0.044, = 0.27), and no significant effect on attention (B) compared to placebo (ES = ?0.077, 95% CI = ?0.20 to 0.047, = 0.22). of eight cognitive subdomains when all doses were included […]