Development of a European Organization for Research and Treatment of Cancer (EORTC) questionnaire module to be used in quality-of-life assessments in head and neck cancer patients. EORTC quality of life study group - Bjordal, K; Ahlner-Elmqvist, M; Tollesson, E; Jensen, A B; Razavi, D; Maher, E J; Kaasa, S (Acta Oncol, 1994)