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 L01 Information Science D007254 +
  L01.453 Information Services D007255 +
   L01.453.183 Bibliography D001634 +
    L01.453.183.544 Databases, Bibliographic D016206 

 L01 Information Science D007254 +
  L01.700 Medical Informatics D008490 +
   L01.700.508 Medical Informatics Applications D008491 +
    L01.700.508.300 Information Systems D007256 +
     L01.700.508.300.221 Databases D019992 +
      L01.700.508.300.221.300 Databases, Bibliographic D016206 
        L01.700.508.300.221.300.500 MEDLINE D016239 
        L01.700.508.300.221.300.650 PubMed D039781