[1] Catholic Univ Louvain, St Luc Univ Hosp, Dept Radiat Oncol, Inst Rech Expt & Clin, Brussels, Belgium
[2] EORTC Headquarters, Brussels, Belgium
[3] Ctr Oscar Lambret, Dept Head & Neck Canc, Lille, France
[4] Ctr Riferimento Oncol, Dept Surg, Aviano, Italy
[5] Ctr Francois Baclesse, Dept Head & Neck Surg, Caen, France
[6] Ctr Alexis Vautrin, Dept Med Oncol, Nancy, France
[7] Univ Hosp, Dept Internal Med, Maastricht, Netherlands
[8] Vrije Univ Amsterdam, Ctr Canc, Med Ctr, Dept Otolaryngol Head & Neck Surg, Amsterdam, Netherlands
[9] Fdn IRCCS Ist Tumori, Dept Head & Neck Med Oncol, Milan, Italy
[10] Inst Cancerol Ouest, Dept Oncol, Nantes, France
[11] Univ Hosp, Dept Radiotherapy, Leiden, Netherlands
[12] Univ Antwerp Hosp, Dept Med Oncol, Edegem, Belgium