[1] Antoni van Leeuwenhoek Hosp, Netherlands Canc Inst, Dept Head & Neck Oncol & Surg, Amsterdam, Netherlands
[2] Univ Gadjah Mada, Dr Sardjito Gen Hosp, Fac Med, Dept Otorhinolaryngol, Yogyakarta, Indonesia
[3] Antoni van Leeuwenhoek Hosp, Netherlands Canc Inst, Dept Biometr, Amsterdam, Netherlands
[4] Univ Gadjah Mada, Dr Sardjito Gen Hosp, Fac Med, Dept Radiotherapy, Yogyakarta, Indonesia
[5] Univ Gadjah Mada, Dr Sardjito Gen Hosp, Fac Med, Div Med Oncol,Dept Internal Med, Yogyakarta, Indonesia
[6] Antoni van Leeuwenhoek Hosp, Netherlands Canc Inst, Dept Radiat Oncol, Amsterdam, Netherlands
[7] Vrije Univ Amsterdam Med Ctr, Dept Pathol, Amsterdam, Netherlands
[8] Univ Gadjah Mada, Fac Med, Dept Histol Cell & Tumour Biol, Yogyakarta, Indonesia
[9] Univ Amsterdam, Acad Med Ctr, Dept Otorhinolaryngol, NL-1105 AZ Amsterdam, Netherlands