Perhaps you should try some spelling variations:
"medical ethical review" » "medicine ethical review", "medical surgical review", "medical technical review", "medical empirical review"
"medical clinical review" » "medical critical review"
"medical ethics reviews" » "medical ethics review", "medical third reviews"

Try widening your search to All Fields.

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: (((("medical ethical review") OR ("medical ethics reviews"))) OR ("medical clinical review")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"medical ethical review\") OR (\"medical ethics reviews\"))) or (\"medical clinical review\"))".
• Removing quotes may allow a broader search: (((( medical ethical review ) OR ( medical ethics reviews ))) or ( medical clinical review )).
• Adding a wildcard symbol may retrieve word variants: (((("medical ethical review") OR ("medical ethics reviews"))) or ("medical clinical review"))*.