Case C-675/17: Judgment of the Court (Third Chamber) of 6 December 2018 (request for a preliminary ruling from the Consiglio di Stato — Italy) — Ministero della Salute v Hannes Preindl (Reference for a preliminary ruling — Recognition of professional qualifications — Directive 2005/36/EC — Recognition of the evidence of formal qualifications obtained following periods of partially overlapping training — Host Member State’s powers of investigation)