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Discover LudwigSuggestions(5)
"has previously been shown" is correct and usable in written English.
You can use this phrase when you want to reference prior evidence or a previous study that supports the point you are making. For example, "Recent research has previously been shown to suggest a link between long-term stress and depression."
Exact(59)
Such noise has previously been shown to affect the acoustic communication of birds, frogs and mammals.
Fermented whey has previously been shown to stimulate biodegradation of n-hexadecane in diesel contaminated soils.
Micro-arc oxidation (MAO) has previously been shown to be an effective method to resist corrosion.
It has previously been shown to be an anti-tumor agent.
Surface modification with heparin has previously been shown to increase vascularization of porous scaffolds.
The new patch has previously been shown to be pharmacokinetically bioequivalent to the marketed fentanyl patch.
It has previously been shown that average intraocular pressure (IOP) exhibits seasonal fluctuations.
It has previously been shown that OCT expression is affected by CKD.
This has previously been shown to aggravate renal vasoconstriction in endotoxemia-induced AKI [53].
Furthermore, it has previously been shown that DNPH reacts with benzoquinones (Fryling et al. 1995).
Interestingly, this relationship has previously been shown experimentally in the context of high-frequency ventilation [28].
More suggestions(17)
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com