66In order to ensure that witness statements remain confidential and that the objectives of such confidentiality are respected, while ensuring that the appellant is properly heard before a decision adversely affecting her is adopted, as the Advocate General noted in point 71 of his Opinion, certain techniques may be used, such as anonymisation, or even disclosure of the substance of the witness statements in the form of a summary, or the redaction of some of the content of those statements (see, to that effect, judgment of 4 April 2019, OZ v EIB, C‑558/17 P, EU:C:2019:289, paragraph 59).
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