1. Head and Neck Service, Department of Surgery Memorial Sloan Kettering Cancer Center New York New York USA
2. Department of Otorhinolaryngology Tan Tock Seng Hospital Singapore Singapore
3. Department of Head and Neck Surgery National Cancer Center Singapore (NCCS) Singapore Singapore
4. Head and Neck Medical Oncology Service, Department of Medicine Memorial Sloan Kettering Cancer Center New York New York USA