By derogation from the provisions of 8.2.2.8.3 and 8.2.2.8.4 of ADN all ADN specialized knowledge certificates the validity of which ends between 1 March 2020 and 1 February 2021 remain valid until 28 February 2021. These certificates shall be renewed for five years if their holder furnishes the proof required in 8.2.2.8.4 a) of ADN and if necessary in 8.2.2.8.4 b), before 1 March 2021. The new period of validity shall begin with the original date of expiry of the certificate to be renewed.