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Discover LudwigThe phrase "all four studies" is correct and usable in written English.
You can use it when referring to a specific set of four studies in a discussion or analysis.
Example: "The results were consistent across all four studies, indicating a strong correlation."
Alternatives: "the four studies in question" or "each of the four studies".
Exact(60)
All four studies with a total of 276 patients reported the number of responders.
All four studies included at least one measure of processing speed; however, the findings were mixed.
The procedures were performed arthroscopically, and the CA ligament was released in all four studies.
Hypernatremia was associated with increased mortality across all four studies that presented this outcome.
All four studies compared verbal learning and memory abilities in FEM patients and HCs.
Characterization of the patients for all four studies was based on the questionnaire and interview.
The procedures were performed arthroscopically, and the CA ligament was released in all four studies [29, 30, 31, 32].
As all four studies have argued, learner training is of crucial importance in dispelling the myths surrounding hybrid language instruction.
Summing across all four studies of naloxone lay administration effectiveness, a total of 66 witnessed overdose events were reported.
All four studies used the headache diary to evaluate pain control, hence, evaluators could not influence this outcome measure.
These trends held across all four studies and for both complex and abstract questions.
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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