All

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 E02 Therapeutics D013812 +
  E02.190 Complementary Therapies D000529 +
   E02.190.633 Natural Childbirth D009321 
 E04 Surgical Procedures, Operative D013514 +
  E04.520 Obstetric Surgical Procedures D013513 +
   E04.520.252 Delivery, Obstetric D036861 +
    E04.520.252.984 Natural Childbirth D009321