Except for medical devices of Class I, as defined in Annex IX to Directive 93/42/EEC, the fulfilment of the obligations laid down in Articles 4 to 7 of this Regulation shall be reviewed by a notified body during the procedure applicable for conformity assessment as referred to in Article 9 of Directive 90/385/EEC or Article 11 of Directive 93/42/EEC. The review shall be based on a specific sampling method adapted to the class and the complexity of the product.