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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