All

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 N03 Health Care Economics and Organizations D004472 +
  N03.219 Economics D004467 +
   N03.219.521 Financing, Organized D005381 +
    N03.219.521.576 Insurance D007341 +
     N03.219.521.576.343 Insurance, Health D007348 +
      N03.219.521.576.343.800 Managed Care Programs D008329 +
       N03.219.521.576.343.800.750 Preferred Provider Organizations D011243 
 N04 Health Services Administration D006298 +
  N04.590 Patient Care Management D010346 +
   N04.590.374 Delivery of Health Care D003695 +
    N04.590.374.410 Managed Care Programs D008329 +
     N04.590.374.410.750 Preferred Provider Organizations D011243