[1] Univ Texas MD Anderson Canc Ctr, Dept Pathol, Houston, TX 77030 USA
[2] Univ Texas MD Anderson Canc Ctr, Dept Head & Neck Surg, Houston, TX 77030 USA
[3] Univ Texas MD Anderson Canc Ctr, Dept Neurosurg, Houston, TX 77030 USA
[4] Univ Liverpool, Sch Dent, Oral & Maxillofacial Pathol, Liverpool, Merseyside, England
[5] Aintree Univ Hosp NHS Fdn Trust, Cellular Pathol, Liverpool L9 7AL, Merseyside, England
[6] Washington Univ, Sch Med, Dept Pathol & Immunol, St Louis, MO USA
[7] Univ Barcelona, Hosp Clin, Dept Anat Pathol, Barcelona, Spain
[8] Radboud Univ Nijmegen, Med Ctr, Dept Pathol, NL-6525 ED Nijmegen, Netherlands
[9] Univ Gothenburg, Sahlgrenska Canc Ctr, Dept Pathol, Gothenburg, Sweden
[10] Univ Pathologists, Head & Neck Pathol, Rhode Isl Fall River, MA USA
[11] Allegiance Hlth, Dept Pathol, Jackson, MI USA
[12] Hosp Univ Cent Asturias, Dept Otolaryngol, Oviedo, Spain
[13] Univ Oviedo, Inst Univ Oncol Principado Asturias, Oviedo, Spain
[14] Univ Udine, Sch Med, I-35031 Udine, Italy
[15] Beth Israel Deaconess Med Ctr, Dept Pathol, New York, NY 10003 USA
[16] Johns Hopkins Med Inst, Dept Pathol, Baltimore, MD 21205 USA
[17] Johns Hopkins Med Inst, Dept Otolaryngol Head & Neck Surg, Baltimore, MD 21205 USA
[18] Univ Algarve, Dept Ciencias Biomed & Med, Faro, Portugal
[19] Univ Arkansas Med Sci, Dept Pathol, Little Rock, AR 72205 USA
[20] Shizuoka Canc Ctr Hosp & Res Inst, Div Pathol, Shizuoka, Japan
[21] Univ Hlth Network, Toronto Gen Hosp, Dept Pathol, Toronto, ON, Canada
[22] Univ Toronto, Dept Lab Med & Pathobiol, Toronto, ON, Canada
[23] Radboud Univ Nijmegen, Dept Otolaryngol Head & Neck Surg, NL-6525 ED Nijmegen, Netherlands
[24] Int Head & Neck Sci Group, Udine, Italy