It's not a very frequent occurrence.

This is not common at all. This is a very unusual occurrence for us.

It is driving up the cost of health care because physicians are facing more challenges.

Informed physicians will be less likely to go bare. It places a tremendous amount of importance on proper asset protection.

Nevertheless, as is a frequent occurrence in science, a general hypothesis was constructed from a few specific instances of a phenomenon.

(Meijer) knew, or should have known, that criminal activity in its ... store and surrounding parking lot was a frequent occurrence.