[1] Antoni van Leeuwenhoek, Netherlands Canc Inst, Dept Head & Neck Surg, POB 90203, NL-1006 BE Amsterdam, Netherlands
[2] Univ Groningen, Univ Med Ctr Groningen, Dept Otorhinolaryngol, POB 30001, NL-9700 RB Groningen, Netherlands
[3] Univ Amsterdam, Acad Med Ctr, Dept Oral & Maxillofacial Surg, POB 22660, NL-1100 DD Amsterdam, Netherlands