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 C04 Neoplasms D009369 +
  C04.588 Neoplasms by Site D009371 +
   C04.588.443 Head and Neck Neoplasms D006258 +
    C04.588.443.665 Otorhinolaryngologic Neoplasms D010039 +
     C04.588.443.665.710 Pharyngeal Neoplasms D010610 +
       C04.588.443.665.710.485 Hypopharyngeal Neoplasms D007012 
       C04.588.443.665.710.650 Nasopharyngeal Neoplasms D009303 
       C04.588.443.665.710.684 Oropharyngeal Neoplasms D009959 +

 C07 Stomatognathic Diseases D009057 +
  C07.550 Pharyngeal Diseases D010608 +
   C07.550.745 Pharyngeal Neoplasms D010610 +
     C07.550.745.436 Hypopharyngeal Neoplasms D007012 
     C07.550.745.650 Nasopharyngeal Neoplasms D009303 
     C07.550.745.671 Oropharyngeal Neoplasms D009959 +

 C09 Otorhinolaryngologic Diseases D010038 +
  C09.647 Otorhinolaryngologic Neoplasms D010039 +
   C09.647.710 Pharyngeal Neoplasms D010610 +
     C09.647.710.485 Hypopharyngeal Neoplasms D007012 
     C09.647.710.650 Nasopharyngeal Neoplasms D009303 
     C09.647.710.685 Oropharyngeal Neoplasms D009959 +

 C09 Otorhinolaryngologic Diseases D010038 +
  C09.775 Pharyngeal Diseases D010608 +
   C09.775.549 Pharyngeal Neoplasms D010610 +
     C09.775.549.485 Hypopharyngeal Neoplasms D007012 
     C09.775.549.650 Nasopharyngeal Neoplasms D009303 
     C09.775.549.685 Oropharyngeal Neoplasms D009959 +