Case T-371/17: Judgment of the General Court of 9 April 2019 — Qualcomm and Qualcomm Europe v Commission (Competition — Market for baseband chipsets used in consumer electronic devices — Administrative procedure — Article 18(3) and Article 24(1)(d) of Regulation (EC) No 1/2003 — Decision requesting information — Obligation to state reasons — Necessity of the information requested — Proportionality — Burden of proof — Privilege against self-incrimination — Principle of good administration)