1. Department of Surgery, Head and Neck Service Memorial Sloan Kettering Cancer Center New York New York USA
2. Department of Oncology, Radiotherapy and Plastic Surgery Sechenov University Moscow Russia
3. Department of Otolaryngology, Head and Neck Surgery Beaumont Hospital & The Royal College of Surgeons in Ireland Dublin Ireland
4. Royal College of Surgeons Ireland Dublin Ireland
5. Department of Surgery Memorial Sloan Kettering Cancer Center New York New York USA