13 14 HF is difficult to diagnose accurately as symptoms are often non-specific and physical signs can be difficult to elicit 15 16; there is evidence to suggest that diagnosis is missed in up to two-thirds of cases.
Though difficult to statistically isolate, there is evidence pointing to the trend.
Although specific genetic mechanisms behind long life are notoriously difficult to prove, there is some evidence that centenarians may be less likely to possess specific genetic variations that predispose people to problems like cardiovascular disease, diabetes, and high cholesterol.
Hanging is extremely difficult to prevent, as evidenced by the fact that even prisoners manage it.
Local commerce is, indeed, difficult to monetize, as evidenced by Groupon and Yelp's continuing quarterly losses.
But even in the immediate wake of a ferocious blow to the head, traumatic brain injury can be difficult to show unless there is evidence of bleeding in or swelling of the brain.
The specific criteria, however, are difficult to establish, as evidence is limited due to multiple-embryo transfers either confounding the analysis or lacking in the case of SET, when additional embryos are not used.
The ruling is important because it can be difficult to find evidence that an employer deliberately singled out one or a group of employees.
There is still no strict definition of blasphemy, and it can be difficult to give evidence, because even repeating the words that have given rise to the charge is considered blasphemous.
It can be difficult to find evidence for the value of prevention, and changes are often subtle, small, cumulative or mysterious.
