An employed or self-employed person who satisfies the conditions of the legislation of the competent State for entitlement to benefits, taking account where appropriate of the provisions of Article 18, and:
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who is authorised by the competent institution to go to the territory of another Member State to receive there the treatment appropriate to his condition,
shall be entitled:
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to benefits in kind provided on behalf of the competent institution by the institution of the place of stay … in accordance with the provisions of the legislation which it administers, as though he were insured with it; the length of the period during which benefits are provided shall be governed, however, by the legislation of the competent State;
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