_:n237f109e3f1c4083b8489168a8c05c73xb1
<http://schema.org/keywords>
"Public Health,Medicine/Public Health,general,Epidemiology,Environmental Health,Biostatistics,Vaccine"
<https://bmcpublichealth.biomedcentral.com/articles/10.1186/s12889-015-1991-z/figures/2>