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 G08 Reproductive and Urinary Physiology D012101 +
  G08.520 Reproduction D012098 +
   G08.520.769 Pregnancy D011247 +
    G08.520.769.326 Labor, Obstetric D007743 +
     G08.520.769.326.200 Labor Onset D007745 +
       G08.520.769.326.200.080 Labor Stage, First D007747 
       G08.520.769.326.200.090 Labor Stage, Second D007748 
       G08.520.769.326.200.110 Labor Stage, Third D007749