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Glossary of terms
| CIs | Confidence intervals |
| EPHPP | Effective Public Health Practice Project |
| HNCs | Head and neck cancers |
| HN | Head and neck |
| ICD | International classification of disease |
| MOOSE | Meta-analysis of Observational Studies in Epidemiology |
| N | Number of studies |
| OCs | Oral cancers |
| OR | Odds ratio |
| PRISMA | Preferred Reporting Items for Systematic Review and Meta-Analysis |
| UADT | Upper aerodigestive tract |
