Perhaps you should try some spelling variations:
decreased retrieval » decreased retinol (Expand search), decreased prefrontal (Expand search), decreased peripheral (Expand search)
retrieval process » retrieval models (Expand search), removal process (Expand search)
decrease faster » decrease after (Expand search), decrease further (Expand search), decreased after (Expand search)
faster decrease » rate decrease (Expand search)
decrease their » decrease the (Expand search), increase their (Expand search), decreases the (Expand search)
their decrease » the decrease (Expand search), their disease (Expand search), the decreased (Expand search)
in decreased » is decreased (Expand search), in deceased (Expand search), and decreased (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 in decreased retrieval process ) OR ( decrease their decrease faster decrease ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease in decreased retrieval process ) OR ( decrease their decrease faster decrease ))*.