(e) kept in a form which permits direct or indirect identification of data subjects for no longer than is necessary for the purposes for which the personal data are processed; personal data may be stored for longer periods insofar as the data will be processed solely for historical, statistical or scienti
fic research or for archive purposes in accordance
with the rules and conditions of Articles 83 and 83a and if a periodic review is carried out to assess the necess
ity to continue the storage ...[+++], and if appropriate technical and organizational measures are put in place to limit access to the data only for these purposes (storage minimisation) ;