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Table 1 Metadata enriching steps undertaken for each publication

From: A systematic review of natural language processing applied to radiology reports

Metadata enriching steps
1. Match the paper with its DOI via the Crossref API [11]
2. If DOI matched, check Semantic Scholar for metadata/abstract [12]
3. If no DOI match and no abstract, search PubMed for abstract
4. Search arXiv [13] (for a pre-print)
5. If no PDF link, search Unpaywall for available open access versions [14]
6. If PDF but no separate abstract via Semantics Scholar/PubMed, extract abstract from the PDF