Article 24 2.

where the pensioner is entitled to benefits in kind under the legislation of a single Member State, the cost shall be borne by the competent institution of that Member State;

where the pensioner is entitled to benefits in kind under the legislation of two or more Member States, the cost thereof shall be borne by the competent institution of the Member State to whose legislation the person has been subject for the longest period of time; should the application of this rule result in several institutions being responsible for the cost of benefits, the cost shall be borne by the institution applying the legislation to which the pensioner was last subject.