39It is settled case-law that the concept of ‘worker’ for the purposes of Directive 92/85 may not be interpreted differently according to each national law and must be defined in accordance with objective criteria which distinguish the employment relationship by reference to the rights and duties of the persons concerned. The essential feature of an employment relationship is that, for a certain period of time, a person performs services for and under the direction of another person, in return for which he receives remuneration (see, by analogy, in the context of freedom of movement for workers and the principle of equal pay for men and women, Case 66/85 Lawrie-Blum [1986] ECR 2121, paragraphs 16 and 17, and Case C-256/01 Allonby [2004] ECR I-873, paragraph 67; and, in the context of Directive 92/85, Case C-116/06 Kiiski [2007] ECR I-7643, paragraph 25).
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