Table 1 List of included head and neck sites and subsites

   Tongue (incl. base of the tongue, other parts of the tongue)

C01-C02

   Mouth (incl. gum, floor of the mouth, palate)

C03-C06

Pharynx

   Tonsil

C09

   Oropharynx

C10

   Piriform sinus

C12

   Hypopharynx

C13

   Pharynx unspecified (incl. Waldeyer's ring, overlapping lesion of lip, oral cavity and pharynx)

C14

Larynx

C32