The phrase "at their onset" is correct and usable in written English.
It can be used to refer to the initial stage or beginning of something, such as a condition, event, or process.
Example: "The symptoms of the illness are often mild at their onset, making it difficult to diagnose."
Alternatives: "at the beginning" or "in the early stages".
He wasn't the best rapper in the group at their onset, and worked to get better, with traceable results that improved everyone around him.
These feathered dinosaurs indicate that, at their onset, feathers must have had a different function, perhaps insulating the bodies of animals that had metabolically diverged from their cold-blooded, reptilian ancestors.
A closed-form expression for the leading-order dispersion coefficient, describing the trend of Lamb-wave branches at their onset from thickness resonances, is derived for an arbitrary anisotropic plate.
The patients with heterozygous for the LMNA E82K mutation showed clinical phenotypes of heart dilation and associated with conduction system disease at their onset age of 32 or 33 years [15].
No scenario which does not take these constraints at their onset are or significant interest.
All of the sera samples were obtained from the patients in an acute phase at their onset or recurrence.
Scores of powerful companies have embraced freemium--at least at their onsets.
Despite its frequency and severity, the lack of a diagnostic gold standard makes it challenging to differentiate primary CNS lupus from secondary neuropsychiatric (NP) manifestations unrelated to SLE at their onsets [ 1- 3].
This work investigates the similarities/differences of one-dimensional, laminar, atmospheric pressure premixed ethylbenzene flames at their soot onset threshold (ϕcritical).
This work investigates five different one-dimensional, laminar, atmospheric pressure, premixed ethanol/ethylbenzene flames (0%, 25%, 50 %, 75 and 90%and90%ol by wethanolat their soot onset threshold (ϕcritical).
Second, cancers could be detected at their molecular onset, before anatomic changes become apparent.
