"But with a nine-year time series, it is difficult to rule out decadal variation".
Given so many other group to group comparisons, it be-comes difficult to rule out chance for any other individual comparison.
However, malignancy might be difficult to rule out within 72 h after the onset of symptoms.
But it is difficult to rule out another situation like Mrs Miller's.
However, it is very difficult to rule out small contributions from Neanderthals or H. erectus without looking at their genes directly.
It is difficult to rule out that possibility decisively, since little is known about the period of Aristotle's life from 341 335.
As cloning and genetic technologies advance, it's difficult to rule out any possibility.
It is, however, difficult to rule out completely the possible need for an elevated cortical inhibition during the ISI period.
However, the evidence underlying the measure of intervention effect was relatively weak making it difficult to rule out bias and/or confounding of intervention effects.
However, specific contaminating events by ingestion are difficult to rule out because human prion diseases can have silent incubation periods exceeding 50 years, as demonstrated for kuru [8].
It is more difficult to rule out ancient admixture.
