Opinion of Advocate General Pitruzzella delivered on 11 July 2019.#Infohos v Belgische Staat.#Request for a preliminary ruling from the Hof van Cassatie.#Reference for a preliminary ruling – Taxation – Value added tax (VAT) – Sixth Directive 77/388/EEC – Article 13A(1)(f) – Exemptions – Services supplied by independent groups of persons – Services provided to members and non-members.#Case C-400/18.