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The phrase "as control group" is not correct in written English.
It should be "as a control group" to be grammatically accurate.
Example: "The participants were divided into two groups, with one group receiving the treatment and the other serving as a control group."
Alternatives: "as a reference group" or "as a comparison group."
Exact(60)
An empty defect served as control group.
The remaining 280 buildings served as control group.
Four patients without CPT served as control group.
Septal cartilage implants, without encapsulation served as control group.
Eight normal cycling women were used as control group.
Other class, as control group, received traditional teacher-led tasks.
As control group 65 healthy donors (51 males, mean age 61±14) were also evaluated.
Fifteen H-ChC were performed immunohistochemistry. Thirty-two HCC and 28 iCCA were also performed immunohistochemistry as control group.
The experimental resin without fillers was used as control group.
Foils without nanoparticles were used as control group.
Pure Transbond XT composite discs were used as control group.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com