Opinion of Advocate General Pikamäe delivered on 19 December 2019.#European Commission and Slovak Republic v Dôvera zdravotná poistʼovňa, 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.#Joined Cases C-262/18 P and C-271/18 P.