Case C-274/09: Judgment of the Court (Third Chamber) of 10 March 2011 (reference for a preliminary ruling from the Oberlandesgericht München (Germany)) — Privater Rettungsdienst und Krankentransport Stadler v Zweckverband für Rettungsdienst und Feuerwehralarmierung Passau (Public procurement — Directive 2004/18/EC — Public service concession — Rescue service — Distinction between ‘public service contract’ and ‘service concession’ )