30The Court has held on a number of occasions that it is possible for the risk of seriously undermining the financial balance of a social security system to constitute per se an overriding reason in the general interest capable of justifying an obstacle to the freedom to provide services (Case C-158/96 Kohll [1998] ECR I-1931, paragraph 41; Smits and Peerbooms, paragraph 72; and Müller-Fauré and van Riet, paragraph 73).
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