By the 1870s this had become a matter of serious concern.

And it's clearly a matter of concern to the President.

The low performance in primary education is also matter of concern.

Clearly too far away to be a matter of concern.

All were close enough to be a matter of real concern.

"I have not heard this as being a matter of high concern at other companies."

It should be a matter of huge concern to us all.

A baby's head is a matter of great concern to the family.

This must be a matter of serious concern for the Church.

That should be a matter of concern for us all.