Case C-134/18: Judgment of the Court (Eighth Chamber) of 14 March 2019 (request for a preliminary ruling from the Arbeidsrechtbank Antwerpen — Belgium) — Maria Vester v Rijksinstituut voor ziekte- en invaliditeitsverzekering (Reference for a preliminary ruling — Social security systems — Invalidity benefits — Articles 45 and 48 TFEU — Freedom of movement for workers — Regulation (EC) No 883/2004 — Different benefit schemes in the Member States — ‘Primary period of incapacity to work’ — Duration — Benefits for incapacity for work — Disadvantages for migrant workers)