2.3. Data Collection

Data included in the analysis and discussion were extracted by two reviewers (T.M.G. and R.G.). Disagreements were resolved by discussion. Primary outcomes were patient age, sex, and race. Secondary outcomes included smoking history, alcohol history, history of prior cancer, and origin site of HPV-related OPSCC, classified as tonsil, base of tongue (BOT), both sites, or not otherwise specified (NOS). In instances of incomplete data, an attempt was made to contact the primary author via email for clarification or sharing of primary data.