Case C-173/09: Judgment of the Court (Grand Chamber) of 5 October 2010 (reference for a preliminary ruling from the Administrativen sad Sofia-grad — Bulgaria) — Georgi Ivanov Elchinov v Natsionalna zdravnoosiguritelna kasa (Social security — Freedom to provide services — Sickness insurance — Hospital treatment provided in another Member State — Prior authorisation — Conditions of application of the second subparagraph of Article 22(2) of Regulation (EEC) No 1408/71 — Methods of reimbursement to the insured person of hospital expenses incurred in another Member State — Obligation on a lower court to comply with the directions of a higher court)