Using routine data to estimate survival and recurrence in head and neck cancer: our preliminary experience in twenty patients

Table S1. List of ICD-10 codes accepted as evidence of head and neck malignancy. Table S2. List of OPCS 4.3 codes accepted as evidence of recurrence if given as second modality of treatment. Table S3. Examples of OPCS codes not considered to represent recurrent disease. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.