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Discover LudwigSuggestions(5)
'this study was approved by' is a correct and usable phrase in written English.
It is typically used when you are referring to a study that has been granted approval by some sort of governing body or authority. For example, "This study was approved by the Ethics Review Committee before it was conducted."
Exact(60)
This study was approved by the institutional review board.
Furthermore, this study was approved by the local ethical committee.
This study was approved by the institutional review board (waived).
This study was approved by the CSU human ethics committee.
This study was approved by our hospital Ethics Committee.
This study was approved by our institutional review board.
This study was approved by the university ethics committee.
This study was approved by the institutional review board (C2015022).
This study was approved by the University West Ethics Committee.
This study was approved by an Institutional Review Board.
This study was approved by the respective IRBs.
More suggestions(16)
this study was endorsed by
this study was authorized by
this report was approved by
this procedure was approved by
this manuscript was approved by
this study was limited by
this study was guided by
this study was developed by
this rule was approved by
this law was approved by
this research was approved by
this protocol was approved by
this study was conceived by
this registry was approved by
this study was exempted by
this decision was approved by
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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