Sentence examples for been difficult to correlate from inspiring English sources

Because of this, it has often been difficult to correlate rock strata with layers from other localities.

It has been difficult to correlate tumour mutations or protein expression profiles with responses to PI3K inhibitors.

However, it has been difficult to correlate major bleeding with high risk of falls and is often overstated in elderly frail patients.

However, it has been difficult to correlate specific proteases with their substrates because many proteases act at the same time in vivo.

Endotoxin's true pathologic role during and after CPB, however, has been called into question as it has been difficult to correlate the degree of endotoxemia with adverse clinical outcomes.

However, CD34 has suggested to be both a hematopoietic and endothelial progenitor and mature endothelial marker [ 8– 10], hence, it has been difficult to correlate CD34+ cell numbers in peripheral blood or UCB with ECFC content in normal individuals.

The different literature reports are difficult to correlate due to the large variances.

As tantalizing as the rankings may be, it is difficult to correlate them to the number of books sold, unless you are J.

Some of these can be well correlated to the standard European ammonite biozones; however, many stratigraphic sequences in Asia and North America are difficult to correlate globally.

In addition, because of the limited geographic range of many species, it is difficult to correlate strata between regions of the world.

Although it is difficult to correlate these two phenotypes directly, future studies of mechanical sensitivities of nociceptive fibers by single-fiber recording in the skin-nerve preparation might make clear the causal relation between cellular response and the behavior.