No clear cause for the B 1 2 deficiency was identified in the remaining seven patients.

Sometimes there is a clear cause, like not getting enough iron.

But no one has found a clear cause for the gas discharge.

There is a clear cause for epilepsy in only a minority of the cases.

Fortunately, there may be a clear cause, and treatments can help.

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

In most cases, no clear cause can be shown.

There are three clear causes of weak growth in roses.

In many children, there is no clear cause of strabismus.