26It follows that an employment relationship implies the existence of a hierarchical relationship between the worker and his employer, and that the issue whether such a relationship exists must, in each particular case, be assessed on the basis of all the factors and circumstances characterising the relationship between the parties (judgments of 10 September 2015, Holterman Ferho Exploitatie and Others, C‑47/14, EU:C:2015:574, paragraph 46, and of 20 November 2018, Sindicatul Familia Constanţa and Others, C‑147/17, EU:C:2018:926, paragraph 42).
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