| CI | confidence interval |
| CRF | cancer-related fatigue |
| EORTC | European Organization for Research and Treatment of Cancer |
| FA | fatigue subscale of the EORTC QLQ-C30 questionnaire |
| HADS | Hospital Anxiety & Depression Scale |
| HN5000 | Head and Neck 5000 study |
| HNC | head and neck cancer |
| HPV | human papilloma virus |
| IL | interleukin |
| NCCN | National Comprehensive Cancer Network |
| OR | odds ratio |
| QLQ | Quality of Life Questionnaire |
| QoL | quality of life |
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