[1] Univ Roma La Sapienza, Dept Radiotherapy, Piazzale Aldo Moro 5, I-00185 Rome, Italy
[2] Fdn IRCCS Ist Nazl Tumori, Head & Neck Med Oncol Unit, Milan, Italy
[3] Natl Canc Inst Regina Elena, Dept Radiotherapy, Rome, Italy
[4] AOS Maria, Dept Radiat Oncol, Terni, Italy
[5] AO S Paolo, Dept Med Oncol, Milan, Italy
[6] IRCCS San Martino IST, Largo R Benzi 10, I-16132 Genoa, Italy
[7] Fdn IRCCS Ist Nazl Tumori, Support Care Canc Unit, Milan, Italy
[8] Univ Brescia, Spedali Civili Hosp, Dept Radiat Oncol, I-25121 Brescia, Italy
[9] Univ Messina, Dept Radiat Oncol, I-98100 Messina, Italy
[10] Univ Groningen, Univ Med Ctr Groningen, Dept Radiat Oncol, Groningen, Netherlands
[11] Vanderbilt Univ, Dept Med, Div Hematol Oncol, Nashville, TN USA
[12] Univ Amsterdam, Acad Med Ctr, Dept Oral & Maxillofacial Surg, Meibergdreef 9, NL-1105 AZ Amsterdam, Netherlands
[13] Univ Amsterdam, Acad Ctr Dent Amsterdam, Dept Med Dent Interact, Amsterdam, Netherlands
[14] Vrije Univ Amsterdam, Amsterdam, Netherlands
[15] AO S Croce & Carle, Dept Radiat Oncol, Cuneo, Italy
[16] Univ Connecticut, Ctr Hlth, Sect Oral Med, MC1605,263 Farmington Ave, Farmington, CT 06030 USA