They have known each other from the days of those earlier studies.
Earlier studies have found similar results for men, they said.
Earlier studies had found a rate of less than 4%.
That research placed the earlier studies in a very different light.
These are quite different to what the other authors have found in earlier studies.
The image was based on an earlier study and a smaller 1859 version.
The area was the site of an early archaeological study in the 1950s.
An earlier study of men also showed a protective effect.
Looking at them, you can see how the project evolved from the early studies to the final product.
The new findings grew out of the team's earlier studies on the cancer.