_:n4bc9bc4927434794a6750b1946953587xb5
<http://schema.org/valueRequired>
"true"^^<http://www.w3.org/2001/XMLSchema#boolean>
<https://jopdevrieze.nl/suspicions-grow-that-nanoparticles-in-pfizers-covid-19-vaccine-trigger-rare-allergic-reactions/>