#medical_scientist__medicalscientist  a scientist who studies disease processes
  supertype:  scientist__man_of_science  a person with advanced knowledge of one of more sciences
  subtype:  epidemiologist  a medical scientist who studies the transmission and control of epidemic diseases
  subtype:  immunologist__serologist  a medical scientist who specializes in immunology
     instance:  Sir_Peter_Brian_Medawar__Medawar__medawar__Peter_Medawar
  subtype:  toxicologist  one who studies the nature and effects of poisons and their treatment
     instance:  Alice_Hamilton__Hamilton

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