Case C-400/12: Judgment of the Court (Second Chamber) of 16 January 2014 (request for a preliminary ruling from the Upper Tribunal (Immigration and Asylum Chamber), London (United Kingdom)) — Secretary of State for the Home Department v M.G. (Reference for a preliminary ruling — Directive 2004/38/EC — Article 28(3)(a) — Protection against expulsion — Method for calculating the 10-year period — Whether periods of imprisonment are to be taken into account)