undefined method 'sourcedb' for nil

PubMed:32133152 / 1776-1779 JSONTXT

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LitCovid-PAS-Enju

Id Subject Object Predicate Lexical cue
EnjuParser_T265 0-3 DT denotes the

LitCovid-TimeML

Id Subject Object Predicate Lexical cue
tok320 0-3 DT denotes the