Joined Cases C-262/18 P and C-271/18 P: Judgment of the Court (Grand Chamber) of 11 June 2020 — European Commission v Dôvera zdravotná poist'ovňa a.s., Slovak Republic, Union zdravotná poist’ovňa a.s. (Appeal — State aid — Article 107(1) TFEU — Social security system — Health insurance bodies — Concepts of ‘undertaking’ and ‘economic activity’ — Social objective — Principle of solidarity — State supervision — Overall assessment — Possibility of seeking profits — Residual competition on quality and on health insurance services offered)