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  1. pdf2018MeShTreeHierarchy.pdf 
    https://www.nlm.nih.gov/mesh/2018/download/2018MeShTreeHierarchy.pdf
    ... 694.700...........................................Pleural Effusion, Malignant C08.528.735...........................................Pleurisy C08.528.735.473...........................................Pleuropneumonia C08.528.778........................................... ...