Controversy still exists as to which band member had the original idea for the piece.

A controversy exists over the value of test preparation and review.

Controversy exists as to its effectiveness in the treatment of chronic pain.

Controversy exists as to the optimal single test to make the diagnosis.

Controversy exists around the origins of the image in this poster.

Some controversy exists as to who exactly gave the order to concentrate artillery at this point.

But that controversy has existed since late last season.

A controversy exists to this day over whether Neil was fired or quit.

Controversy exists over the extent to which these judgments of intelligence are accurate.

Controversy exists as to whether a particular body fat percentage is better for one's health; athletic performance may also be affected.