_:n9542a475281740fcacd389aecc83d84axb1
<http://schema.org/isAccessibleForFree>
"true"^^<http://www.w3.org/2001/XMLSchema#boolean>
<https://bmcpulmmed.biomedcentral.com/articles/10.1186/s12890-021-01548-w/peer-review>