The phrase "additional work is needed to determine" is correct and usable in written English.
It can be used when indicating that further effort or investigation is required to reach a conclusion or make a decision.
Example: "After reviewing the initial findings, we concluded that additional work is needed to determine the root cause of the issue."
Alternatives: "further analysis is required to ascertain" or "more effort is necessary to identify".
She cautions that additional work is needed to determine whether taurine is really involved in the increased fat-burning.
Additional work is needed to determine the precise locations of the QTL and select positional candidate genes influencing these traits.
Additional work is needed to determine what, if any, benefit can be obtained from incorporating composted residue as feed for Nile tilapia.
Additional work is needed to determine the specific iron sources utilized by S. aureus during lung colonization, and the contribution of virulence factors to nutrient iron acquisition in this anatomical site.
Additional work is needed to determine how to improve the survival of cancer patients.
Additional work is needed to determine how these results vary with differences in image quality.
Given the equivocal result of the CFA, additional exploratory work is needed to determine if a more complex factor structure is present.
Further work is needed to determine additional resistance polymorphisms, including validation of putative markers with high quality phenotypic and clinical data.
Since we could not examine all possible differentiation methods, more work is needed to determine whether the signatures described here are sufficient for isolating neural cell types in additional in vitro differentiating cell culture systems.
Further work is needed to determine whether mutant VAPB inclusions represent an ERAC-like compartment, and whether there are additional ER substrates with misfolded cytosolic domains that accumulate in the same structures.
However, more work is needed to determine the extent to which LIMK1 functions primarily through Rac in border cells, as has been proposed (Zhang et al. 2011), or has any additional functions.
