Perhaps you should try some spelling variations:
risk decreased » risk decreases (Expand search), is decreased (Expand search), cross decreased (Expand search)
decrease multi » decrease milk (Expand search), decrease quality (Expand search)
decrease treg » decrease the (Expand search), increase treg (Expand search), decrease their (Expand search)
treg decrease » the decrease (Expand search), urea decrease (Expand search), drugs decrease (Expand search)
decrease risk » decreased risk (Expand search), increase risk (Expand search), decrease in (Expand search)
decreased to » decreased the (Expand search), decreased tgf (Expand search), decreased in (Expand search)

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "(( decrease treg decrease multi purpose ) OR ( decrease risk decreased to decrease ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease treg decrease multi purpose ) OR ( decrease risk decreased to decrease ))*.