The phrase "ascertained hence" is correct and usable in written English.
It can be used to indicate that something has been determined or concluded based on previous information or evidence.
Example: "The results of the experiment were ascertained hence, leading to a clearer understanding of the phenomenon."
Alternatives: "determined from this" or "concluded from this".
On limitations, firstly, given that this study was cross-sectional in nature the causal direction between the dependent and the independent factors could not be ascertained, hence there is need for longitudinal studies to disentangle the casual directions between these factors.
As the tumour was very large at the time of imaging, its site of origin could not be ascertained, hence a diagnosis of a sarcomatous tumour arising from the pelvis or solid primary omental tumour, with peritoneal carcinomatosis and hepatic metastasis was given.
It should be noted however that the extent to which work contributed to the etiology of musculoskeletal disorders in participants in our study cannot be readily ascertained and is hence largely debatable.
Hence the ascertained selenium levels can be inferred as life-long exposure to selenium without the influence of supplements.
Rather than self-report, cases in Denmark and Sweden were identified via local and national diabetes and pharmaceutical registers [ 26] (www.ssi.dk/Sundhedsdataogit/Registre/Diabetesregisteret.aspx, accessed 11 October 2013) and hence all ascertained cases were considered to be verified.
Relying on the principle of determinability we can distinguish between the subject and the predicate of a given synthesis, e.g., in the synthesis 'acute triangle' we can see that 'triangle' can be thought without 'acute' but not the other way around, and hence ascertain that 'acute' is the predicate and 'triangle' the subject.
Hence, ascertaining if the two major strains originated from the same initial focus of infection, Tambun, is not possible.
Hence, ascertaining factors explaining variation among individuals' quality of life is critical for promoting healthy ageing, particularly among older fallers.
Information about advice received about drinking during pregnancy was ascertained using closed questions and hence was not part of the thematic analysis.
Whether or not the occurrence of multiple spoligotypes was due to exogenous super infection or reactivation of latent infection could not be ascertained at this stage, and hence needs to be further investigated by combining epidemiological information with various molecular typing methods.
By not requiring knowledge of prisoners' injector status, this study ascertained all drug-related deaths and, hence, avoided reliance on drug-using prisoners' willingness to self-identify.
