Must Article 11A(1)(a) of the Sixth Directive, 2 incorporated in Article 73 of Directive 2006/112/EC, be interpreted as meaning that the 'healthcare lump sum' disbursed by sickness insurance funds to residential care homes for the elderly pursuant to Article L. 174-7 of the Code de la sécurité sociale and exempted from value added tax under Article 261(4)(1b) of the Code général des impôts represents a subsidy which is directly linked to the price of the healthcare services provided to residents and which thus falls within the scope of value added tax?