All

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 C07 Stomatognathic Diseases D009057 +
  C07.465 Mouth Diseases D009059 +
   C07.465.614 Oral Fistula D016155 +
    C07.465.614.421 Oroantral Fistula D009957 
 C23 Pathological Conditions, Signs and Symptoms D013568 +
  C23.300 Pathological Conditions, Anatomical D020763 +
   C23.300.575 Fistula D005402 +
    C23.300.575.500 Oral Fistula D016155 +
     C23.300.575.500.550 Oroantral Fistula D009957