Head and Neck Neoplasms Humans Retrospective Studies Squamous Cell Carcinoma of Head and Neck head and neck tumor human retrospective study Article Carcinoma, Squamous Cell Delay Head and neck cancer Histology Incidental Findings Incidental findings Laryngeal Neoplasms Laryngeal neoplasms Neoplasm Invasiveness Neoplasm Recurrence, Local Neoplasm Staging Netherlands Overall survival Pathology Prognosis Recurrence Squamous cell carcinoma Survival Time-to-Treatment Time-to-treatment initiation aged cancer patient