All

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 L01 Information Science D007254 +
  L01.143 Communication D003142 +
   L01.143.140 Answering Services D039604 
 L01 Information Science D007254 +
  L01.178 Communications Media D003146 +
   L01.178.847 Telecommunications D013685 +
    L01.178.847.698 Telephone D013689 +
     L01.178.847.698.249 Answering Services D039604 
 N04 Health Services Administration D006298 +
  N04.590 Patient Care Management D010346 +
   N04.590.374 Delivery of Health Care D003695 +
    N04.590.374.034 After-Hours Care D039602 +
     N04.590.374.034.500 Answering Services D039604 
 N05 Health Care Quality, Access, and Evaluation D017530 +
  N05.300 Delivery of Health Care D003695 +
   N05.300.049 After-Hours Care D039602 +
    N05.300.049.500 Answering Services D039604