"We'll have to check every once in a while," Dortmunder said.

I check on him every once in a while.

Everyone over 20 should know their cholesterol numbers, and get them checked at least once every five years.

The next morning he asked the villagers to check on the paraplane once in a while to see if it was all right.

"I check on him every once in a while," Edwards said after the news conference.

The study's limits include the fact that participants only had their vitamin D level checked once.

"I've never once in my life checked the stock price," he said.

In the past, I made sure he had it checked once a year.

"I'll come by and check on you every once in a while, if that will help."

People older than 20 should have their cholesterol levels checked at least once every five years.