1.   A very recent study confirms this once again.

2.   Modern studies of Mars confirm the seasonal variations of the surface brightness, but without biological intervention.

3.   Our study confirms that finding but questions its relevance and its implications.

4.   Several recent studies have confirmed the efficacy of lengthy spacing.

5.   The studies invariably confirmed the validity of earlier findings.

6.   The study also confirms that referral rates are lower in areas where there is no local renal unit nearby.