29In order to give a useful answer to the referring court, it must be recalled, as a preliminary point, that Regulation No 883/2004, the aim of which is to coordinate the disparate national systems, allows different national social security schemes to exist, but does not set up a common scheme of social security. Thus, according to settled case-law, Member States retain the power to organise their own social security schemes (see, by analogy, judgments of 21 February 2013, Salgado González, C‑282/11, EU:C:2013:86, paragraph 35 and the case-law cited, and of 7 December 2017, Zaniewicz-Dybeck, C‑189/16, EU:C:2017:946, paragraph 38.)
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