(16) These improvements appear to be independent of direct effects on sleep or anxiety. (naturopathiccurrents.com)
Solar has its largest direct effect in the stratosphere and further top down, as more and more is absorbed / reflected in different layers. (realclimate.org)
The path analysis found direct effects from physical function, bodily pain and depression to fatigue (all, P < 0.01). (bmjopen.bmj.com)