Links
[1] https://www.sciensano.be/sites/default/files/20180810_polio_incident_gsk_pra_update_270818_1.pdf
[2] https://www.sciensano.be/nl/biblio?f%5Bauthor%5D=180283&f%5Bsearch%5D=Risk%20Assessment%20Group
[3] https://www.sciensano.be/nl/biblio?f%5Bkeyword%5D=675&f%5Bsearch%5D=Risk%20Assessment