Postoperative irradiation with or without concomitant chemotherapy for locally advanced head and neck cancer. - Bernier,J.; Domenge,C.; Ozsahin,M.; Matuszewska,K.; Lefebvre,J.L.; Greiner,R.H.; Giralt,J.; Maingon,P.; Rolland,F.; Bolla,M.; Cognetti,F.; Bourhis,J.; et al. (N Engl J Med, 2004)