Experts say a combination of factors is probably behind the difference in care.

So, what is the right combination of factors to best improve performance?

But the inflation seems to be a combination of factors.

The gap between workers' skills and companies' needs, they say, results from a combination of factors.

In reality, the financial problems resulted from a combination of several factors.

For most people, it's probably a combination of different factors.

A combination of factors and events was most likely behind his remarks.

The French were to win the final set by a combination of factors.

It is your body's reaction to a combination of emotional and physical factors.

To run every possible combination of factors would be 128 runs.