The phrase "are lacking due to" is correct and usable in written English.
It can be used to indicate that something is missing or insufficient as a result of a specific reason or cause.
Example: "The resources for the project are lacking due to budget constraints."
Alternatives: "are missing because of" or "are insufficient owing to".
Despite the highest burden of Typhoid fever in children globally, exact estimates of morbidity and mortality are lacking due to scarcity of published data.
Where private investments are lacking due to perceptions of low financial returns, such "market failure" can be addressed by government grants, although this still raises the spectre of "picking winners" – a taboo since civil servants made heavy bets on projects such as the Anglo-French Concorde, which was technically advanced but could only be sold to the UK and French state-owned airlines.
There cannot be any discourse on happiness where the primary requisites for life are lacking (due to mental illness or death) (Theonoston, OO, II, 309b).
There is an important distinction between taking thyroid hormones with Hashimoto's disease and taking them when hormones are lacking due to age and stress.
Models of the impact of AEs on patients are lacking due to lack of research.
Results were analyzed as reported, but direct comparisons between studies are lacking, due to the high heterogeneity of methodological approaches.
This portion has been well studied; however, its bed profile had been lacking due to the lake's complex morphology.
Thus far, evidence for Fresnel diffraction at sharp edges is lacking due to, as yet, insufficient detector resolution.
It is difficult to determine the positions of organs and blood vessels during endoscopic surgery because visual information is lacking due to the narrow operating area.
The Diamond League – which will replace the six-meeting Golden League – will be aimed at increasing standards of entertainment and competition between the top names, something that has often been lacking due to financial disputes between agents.
However, information on the fatality rates was lacking due to limited availability of any individual and housing census at the time of the event.
