1. Department of Otolaryngology - Head and Neck Surgery; Wayne State University; Detroit Michigan
2. Department of Otolaryngology - Head and Neck Surgery; Sir Mortimer B. Davis-Jewish General Hospital, McGill University; Montreal Quebec Canada
3. Department of E.N.T; Darjeeling District Hospital; Darjeeling India
4. Department of Radiation Oncology; Sir Mortimer B. Davis-Jewish General Hospital, McGill University; Montreal Quebec Canada