Perhaps you should try some spelling variations:
increase mortality » increased mortality (Expand search), increases mortality (Expand search), decreases mortality (Expand search)
mortality based » mortality caused (Expand search), mortality and (Expand search), reality based (Expand search)
decrease toc » decrease of (Expand search), decrease the (Expand search), decreased to (Expand search)
toc decrease » to decrease (Expand search), the decrease (Expand search), not decrease (Expand search)
decrease and » decreases and (Expand search), decrease of (Expand search), decrease the (Expand search)
and increase » and increases (Expand search), and increased (Expand search)
in decrease » in decreased (Expand search), on decrease (Expand search), pain decrease (Expand search)

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (( decrease in decrease toc decrease ) OR ( decrease AND increase mortality based ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( decrease in decrease toc decrease ) OR ( decrease and increase mortality based ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease in decrease toc decrease ) OR ( decrease and increase mortality based ))*.