Case C-548/11: Judgment of the Court (Third Chamber) of 18 April 2013 (request for a preliminary ruling from the Arbeidshof te Antwerpen — Belgium) — Edgard Mulders v Rijksdienst voor Pensioenen (Social security — Regulation (EEC) No 1408/71 — Article 1(r) — Definition of ‘periods of insurance’ — Article 46 — Calculation of retirement pension — Periods of insurance to be taken into consideration — Frontier workers — Period of incapacity for work — Aggregation of similar benefits paid by two Member States — No account taken of a period of incapacity for work as a period of insurance — Residence requirement — Nation rules precluding the cumulation of benefits)