All

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 N04 Health Services Administration D006298 +
  N04.452 Organization and Administration D009934 +
   N04.452.758 Professional Practice D011364 +
    N04.452.758.244 Group Practice D006123 +
      N04.452.758.244.369 Group Practice, Dental D006124 
      N04.452.758.244.400 Group Practice, Prepaid D006125 
      N04.452.758.244.425 Health Maintenance Organizations D006279 
      N04.452.758.244.450 Independent Practice Associations D007193