_:nf5c349091ea147c393c8a3844ab0353exb13
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<http://schema.org/Periodical>
<https://cardiothoracicsurgery.biomedcentral.com/articles/10.1186/1749-8090-7-20/figures/4>