A. Association between test results and disease is a must.

Much of the knowledge about the relationship between diet and disease has been developed over the last century.

The relationship between militarism, war and disease is not new.

Associations between diseases can be established only by population based studies.

There is not a straightforward relationship between infection and disease.

"The overwhelming body of evidence doesn't show a connection between the fibers and disease."

It may take decades or even centuries to completely understand the relationship between genes and disease.

The relationship between cardiovascular disease and depression is especially intimate.

Some studies, however, have found statistical correlations between various diseases and living or working near power lines.

No matter where scientists stand on the relationship between aging and disease, one thing is certain: Without illness, the death rate would drop.