Perhaps you should try some spelling variations:
decreased risk » increased risk (Expand search), decreased in (Expand search)
decrease metal » decreased metal (Expand search), decrease fetal (Expand search), decreased mental (Expand search)
the decreased » the decrease (Expand search), the deceased (Expand search), the increased (Expand search)
risk decrease » risk decreases (Expand search), risk increase (Expand search), break decrease (Expand search)
metal objects » real objects (Expand search), metallic objects (Expand search), data objects (Expand search)
decrease the » decreases the (Expand search), decrease in (Expand search), decrease of (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 the decreased risk decrease ) OR ( decrease _ decrease metal objects ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease the decreased risk decrease ) OR ( decrease _ decrease metal objects ))*.