Case C-440/09: Judgment of the Court (Fifth Chamber) of 3 March 2011 (reference for a preliminary ruling from the Sąd Najwyższy — Poland)) — Zakład Ubezpieczeń Społecznych Oddział w Nowym Sączu v Stanisława Tomaszewska (Social security for migrant workers — Article 45(1) of Regulation (EEC) No 1408/71 — Minimum period required by national law for acquisition of entitlement to a retirement pension — Account to be taken of the period of contribution completed in another Member State — Aggregation — Rules for calculation)