https://www.publications.parliament.uk/pa/ld201314/ldselect/ldeucom/164/164.pdf
https://www.eurofound.europa.eu/sites/default/files/ef_publication/field_ef_document/ef20023en.pdf
https://www.eurofound.europa.eu/sites/default/files/ef_publication/field_ef_document/ef1729en.pdf
http://invs.santepubliquefrance.fr/publications/etat_sante_2017/ESP2017_Ouvrage_complet_vdef.pdf