proton therapy, Head and Neck Cancer, Quality of Life, Health-Related Quality of Life, Radiotherapy-Related Toxicity, Utility, Disutility
Delphi methodology, Proton Therapy, Radiation Therapist, Dosimetrist, Practice Guidelines, Consensus
*Adaptive proton therapy*Intensity modulated proton therapy*Oesophageal cancer*Anatomical changes*Organs at risk*Treatment planning