1. Article 13 shall not preclude the host Member State from requiring the applicant to complete an adaptation period of up to three years or to take an aptitude test if:
(a) the training the applicant has received covers substantially different matters than those covered by the evidence of formal qualifications required in the host Member State;
(b) the regulated profession in the host Member State comprises one or more regulated professional activities which do not exist in the corresponding profession in the applicant's home Member State, and the training required in the host Member State covers substantially different matters from those covered by the applicant's attestation of competence or evidence of formal qualifications.
2. If the host Member State makes use of the option provided for in paragraph 1, it must offer the applicant the choice between an adaptation period and an aptitude test.
Where a Member State considers, with respect to a given profession, that it is necessary t
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