FDG-PET positive lymph node variations during image-guided IMRT for head and neck cancer identify non-responding patients. Issue 1 (February 2016) - Belli, M.; Dell'Oca, I.; Raso, R.; Zerbetto, F.; Chiara, A.; Cattaneo, G.M.; Picchio, M.; Di Muzio, N.; Fiorino, C.; Calandrino, R.