"existent studies" is correct and usable in written English.
You can use it to refer to studies that are already available or have already been conducted. For example, "We can use the results of existent studies to inform our own research."
In addition, existent studies do not investigate whether and how inter-related code anomalies can support the diagnosis of well-known architectural problems.
Among existent studies, Chen and Liu (2007), Liao (2010), and Shih (2008) use questionnaires and interviews to compare the learning motivation of students before and after the implementation of the benchmark policy.
Analyses in existent studies was restricted to error-related processes, but not on processes related to general response monitoring.
The existent studies have been based on small samples, and results have been inconsistent.
Findings from such efforts could surely supplant the existent studies which draw from limited single-institution experiences.
Research on biomechanics during gait in hip OA has, however, up until now focused on the end-stage of disease [ 6], with the vast majority of existent studies describing gait characteristics before and after total hip replacement (THR) [ 7- 17].
The existent study approves the occurrences of Ag-NPs in E. acoroides, and the results were similar when compared with the earlier reviews of nanoparticles [19, 20].
The existent study also indicates that the application of leaves of plant material-based amendments has positive effects on soil properties like soil porosity and water-holding capacity (Table 5).
Many clinical research studies expose subjects to risks in order to collect generalizable information which, if combined with the results of other, as yet non-existent studies, may eventually benefit future patients, assuming the appropriate regulatory authorities approve it, some company or group chooses to manufacture it, and patients can afford to purchase it.
The quality grade "very low" is in fact in most cases a knowledge gap due to a shortage of good primary studies or, non-existent studies.
In one debate, he argued that the state's regulatory burden was excessive for businesses by citing a non-existent study about buffalos.
