undefined method `sourcedb' for nil

PubMed:8181007 / 1720-1723 JSONTXT

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    pubmed-enju-pas

    {"project":"pubmed-enju-pas","denotations":[{"id":"EnjuParser_T245","span":{"begin":0,"end":3},"obj":"DT"}],"namespaces":[{"prefix":"_base","uri":"http://kmcs.nii.ac.jp/enju/"}],"text":"the"}