In 30 to 35 percent of patients, no cause can be found.

In about half of all cases, no cause can be found.

But no cause could be found in many of the children.

I did not need to look far to find the cause.

And sometimes no specific cause can be found at all.

In many cases, however, no clear cause can be found.

What does it do to help these people find common cause with each other?

In 30-35 percent of cases, no cause can be found.

In other cases, it may need to be opened, to find the cause of death.

It did not take long to find the cause of the trouble.