Case C-437/05: Order of the Court (Fifth Chamber) of 11 January 2007 (reference for a preliminary ruling of The Okresní soud v Českém Krumlově, Czech Republic) — Jan Vorel v Nemocnice Český Krumlov (First subparagraph of Article 104(3) of the Rules of Procedure — Social Policy — Protection of the health and safety of workers — Directives 93/104/EC and 2003/88/EC — Concept of working time — Periods of inactivity during on-call duty provided by a doctor at his place of work — Classification — Effect on the remuneration of the person concerned)