EGFR and head and neck squamous cell carcinoma: The most potent Mabs in HNSCC are EGFR antagonists and checkpoint inhibitors, especially PD‐L1 antagonists.49, 50, 53, 55, 56, 57, 58, 60, 116, 117, 128, 130, 131, 142, 143, 148, 165, 171, 172, 173