During the period for which an authorisation has been granted, it may be reviewed at any time, e.g. following information received according to Article 14, if there are indications that any of the conditions referred to in Article 5 are no longer satisfied. In such instances the Member States may require the authorisation holder, or the applicant to whom a modification of the authorisation has been granted in accordance with Article 7, to submit further information necessary for the review. If need be, the authorisation may be prolonged only for the period necessary to complete the review, but shall be prolonged for the period necessary to provide for further information.