Links
[1] https://www.sciensano.be/nl/biblio?f%5Bauthor%5D=705&f%5Bsearch%5D=F.%20Bolle
[2] https://www.sciensano.be/nl/biblio?f%5Bkeyword%5D=762&f%5Bsearch%5D=metalen
[3] https://www.sciensano.be/nl/biblio?f%5Bkeyword%5D=765&f%5Bsearch%5D=Migratierisico%27s
[4] https://www.sciensano.be/nl/biblio?f%5Bkeyword%5D=768&f%5Bsearch%5D=theepotten