The phrase "a supplementary study" is correct and usable in written English.
It can be used when referring to an additional study that provides extra information or support to a primary research project or analysis.
Example: "The researchers conducted a supplementary study to further explore the effects of the new drug on patients."
Alternatives: "an additional study" or "a complementary study".
In this paper, we perform a supplementary study on ENRBF with several properly designed experiments and some further theoretical discussions.
A supplementary study of the electrochemical impedance supports the enhancement of the charge transfer of TiO2 (e−) with the ETPA3 dye.
The herein presented research constitutes a supplementary study in earlier researches for the seismic risk assessment (Baltzopoulou et al. 2012; Eleftheriadou et al. 2014).
A supplementary study was conducted and completed within three months.
A supplementary study confirmed that the immune response is not instrumental for IRE ablation which broadens the potential application space for IRE treatment to immunodepressed patients [38].
In the course of conversations conducted in the field, we came face to face with a phenomenon that, while it was unrelated to our research objectives, raised ethical and clinical concerns that struck us as sufficiently fundamental to form the focus of a supplementary study.
We also designed a second, supplementary study to monitor serum COMP with repeated measurements after the exercise session.
In a second supplementary study 7 individuals were subjected to the same exercise program and sampling of blood was performed at fixed intervals before, immediately after, 30 and 60 minutes after the exercise session and then with 60 minutes interval for another five hours after exercise to monitor the short-term changes of serum COMP.
In a supplementary small study we examined the short-term changes of serum-COMP immediately after exercise, study 2. In study 1 patients aged 36 65 years with symptomatic radiographically verified knee OA, uni- or bilateral Kellgren-Lawrence grade 3 or more, were included in a randomised controlled trial of physical exercise in knee OA.
Parents/guardians retained a copy of consent forms with supplementary study summary pamphlets and investigator contact information.
A supplementary questionnaire study showed the generality of the relevant short-coming in naïve psychology.
