Perhaps you should try some spelling variations:
decrease risk » decreased risk (Expand search), increase risk (Expand search), decrease in (Expand search)
risk decrease » risk decreases (Expand search), risk increase (Expand search), break decrease (Expand search)
decrease toc » decrease of (Expand search), decrease the (Expand search), decreased to (Expand search)
toc decrease » the decrease (Expand search), not decrease (Expand search), or decrease (Expand search)
decrease and » decreases and (Expand search), decrease in (Expand search), decrease of (Expand search)
decrease to » decreased to (Expand search), decrease the (Expand search), decrease pro (Expand search)
and effect » and effects (Expand search)

You may be able to get more results by adjusting your search query.

• Removing quotes may allow a broader search: (( decrease to decrease risk decrease ) OR ( decrease toc decrease and effect ))~.