All

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 E05 Investigative Techniques D008919 +
  E05.318 Epidemiologic Methods D004812 +
   E05.318.308 Data Collection D003625 +
    E05.318.308.985 Vital Statistics D014798 +
     E05.318.308.985.775 Pregnancy Rate D018873 
       E05.318.308.985.775.500 Birth Rate D001723 
 G03 Environment and Public Health D004778 +
  G03.850 Public Health D011634 +
   G03.850.505 Epidemiologic Measurements D015991 +
    G03.850.505.400 Demography D003710 +
     G03.850.505.400.975 Vital Statistics D014798 +
      G03.850.505.400.975.775 Pregnancy Rate D018873 
        G03.850.505.400.975.775.500 Birth Rate D001723 
 G03 Environment and Public Health D004778 +
  G03.850 Public Health D011634 +
   G03.850.520 Epidemiologic Methods D004812 +
    G03.850.520.308 Data Collection D003625 +
     G03.850.520.308.985 Vital Statistics D014798 +
      G03.850.520.308.985.775 Pregnancy Rate D018873 
        G03.850.520.308.985.775.500 Birth Rate D001723 
 G08 Reproductive and Urinary Physiology D012101 +
  G08.520 Reproduction D012098 +
   G08.520.769 Pregnancy D011247 +
    G08.520.769.775 Pregnancy Rate D018873 
 L01 Information Science D007254 +
  L01.280 Data Collection D003625 +
   L01.280.975 Vital Statistics D014798 +
    L01.280.975.775 Pregnancy Rate D018873 
      L01.280.975.775.500 Birth Rate D001723 
 N01 Population Characteristics D011154 +
  N01.224 Demography D003710 +
   N01.224.935 Vital Statistics D014798 +
    N01.224.935.849 Pregnancy Rate D018873 
      N01.224.935.849.500 Birth Rate D001723