 The EORTC guidelines will be strictly followed also in phase IV of the module development. Eligible patients will be contacted by the local study coordinator or a study nurse and informed about the study. After having provided written informed consent, they will be presented with the following two questionnaires for self-report of general symptoms, specific dental and oral symptoms, and quality of life issues; the EORTC QLQ-C30 and the QLQ-OH17. In addition to these two, a short debriefing interview will be conducted by study coordinator study nurse for assessment of feasibility and patients opinion about the questionnaires. 