1. Department of Otolaryngology-Head and Neck Surgery; Wayne State University School of Medicine; Detroit Michigan U.S.A.
2. Michigan Ear Institute; Farmington Hills Michigan U.S.A.
3. Section of Otolaryngology; Department of Surgery; John D. Dingell VA Medical Center; Detroit Michigan U.S.A.
4. Department of Neurosurgery; Wayne State University School of Medicine; Detroit Michigan U.S.A.