Toma S, Bonelli L, Sartoris A, Mira E, Antonelli A, Beatrice F, Giordano C, Benazzo M, Caroggio A, Cavalot AL, Gandolfo S, Garozzo A, Margarino G, Schenone G, Spadini N, Zibordi F, Balzarini F, Serafini I, Miani P, Cortesina G. 2003. Beta-carotene supplementation in patients radically treated for stage I-II head and neck cancer: results of a randomized trial. Oncology Reports 10(6):1895-1901