Case C-581/18: Judgment of the Court (Grand Chamber) of 11 June 2020 (request for a preliminary ruling from the Oberlandesgericht Frankfurt am Main — Germany) — RB v TÜV Rheinland LGA Products GmbH, Allianz IARD SA, (Reference for a preliminary ruling — EU law — General principles — Article 18 TFEU — Prohibition of discrimination on grounds of nationality — Applicability of EU law — Defective breast implants — Insurance against civil liability arising from the production of medical devices — Insurance contract prescribing a geographical limitation on insurance coverage)