Sentence examples for are difficult however from inspiring English sources

Exact figures are difficult, however, for many records were destroyed by the bomb and the overall devastation of the area made accurate accounting for casualties impossible.

Because these studies used different smoke-exposure systems, strains of mice and viruses, direct comparison of these data are difficult; however, it should be noted that we have previously reported greater levels of type I interferons using a nose-only smoke exposure system with the parental strain of our virus [11].

Comparisons are difficult, however, due to differences in the criteria used and the sample compositions.

16 Comparisons are difficult, however, because the types of evidence that was required to determine this is considerably varied.

Comparisons between studies are difficult however because of differences in time frames for readmission, patient groups, and in whether planned readmissions were included.

Comparisons between the studies are difficult, however, because low Apgar score was present 10 times more often among infants in the Collaborative Perinatal Project than in our study.

That could be difficult, however.

Checking them all was difficult, however.

Using placebos effectively is difficult, however.

The family's circumstances were difficult, however.

It would be difficult, however, to imagine otherwise.