This is certainly true once clinical signs are apparent, but the subclinical period is of unknown duration.

Cardioversion should not be performed without adequate anticoagulation in patients with more than 48 hours or unknown duration of AF.

If they were to survive the voyage of unknown duration, they must use some of this other food.

They are here for close observation and investigation which, to them, is the clinical equivalent of a prison sentence of unknown duration.

All this has raised concerns that Germany may be entering a recession of unknown duration.

As the American involvement in Iraq has become a commitment of unknown duration, comparisons to the Vietnam War are more and more common.

There could be no compromise: "one or the other would have to succumb after a struggle of unknown duration.

The agreement on missile testing, disclosed on Sunday, is very limited, far from explicit and of unknown duration.

Beginning in 1941 for an unknown duration of time a policeman patrolled the span, questioning all pedestrians walking the bridge.

It would be the start of a war of unknown duration and immense human, material, and political cost.