Rainfall has a direct link to the growth and width of rings on some kinds of trees.

VOA: special.2010.05.25

Yet many doctors reject this idea of a direct link to Parkinson's.

VOA: special.2009.04.07

The group said there was a direct link between the murder and the anti-apartheid song called "Shoot the Boer."

VOA: standard.2010.04.05

The statement says some research has found a link between sugar consumption and cardiovascular disease, while other research has not found a direct link.

CNN: Sugary drinks linked to 180,000 deaths worldwide

Ridge was asked if there is a direct link between that incident and September 11.

CNN: Homeland security chief: U.S. safer, but work remains

Mr Obama's ad suggests a direct link between it and the current financial crisis.

ECONOMIST: The economy and the election