Perhaps you should try some spelling variations:
by preprocessing » the preprocessing (Expand search), and preprocessing (Expand search), by processing (Expand search)
decreases pain » decreases in (Expand search), decreases and (Expand search), decreases hepatic (Expand search)
pain decrease » can decrease (Expand search), taping decrease (Expand search), strain decrease (Expand search)
decrease with » decreases with (Expand search), increase with (Expand search), decrease in (Expand search)
with decrease » with decreased (Expand search), with deceased (Expand search), with increase (Expand search)
decrease by » decreased by (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: "(( decreases pain decrease by preprocessing ) OR ( decrease with decrease _ decrease ))~".
• Adding a wildcard symbol may retrieve word variants: (( decreases pain decrease by preprocessing ) OR ( decrease with decrease _ decrease ))*.