#spontaneous_abortion__spontaneousabortion__miscarriage__stillbirth  a natural loss of the products of conception
  exclusion:  live_birth
  supertype:  abortion  termination of pregnancy
  subtype:  habitual_abortion  repeated spontaneous abortion (often for no known reason)
  subtype:  imminent_abortion__threatened_abortion  the appearance of symptoms that signal the impending loss of the products of conception
  subtype:  incomplete_abortion__partial_abortion__partialabortion  termination of pregnancy without expulsion of all of the products of conception

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