Competition - Agreements, decisions and concerted practices - Market for antidepressant medicinal products containing the active pharmaceutical ingredient citalopram - Concept of restriction of competition 'by object' - Potential competition - Generic medicinal products - Barriers to market entry resulting from the existence of patents - Agreements concluded between a patent holder and generic undertakings - Article 101(1) and (3) TFEU - Errors of law and of assessment - Obligation to state reasons - Rights of defence - Legal certainty - Fines