1. Department of Otolaryngology; University of Minnesota; Minneapolis Minnesota U.S.A.
2. Department of Otolaryngology-Head and Neck Surgery; Gebze Fatih State Hospital; Gebze Kocaeli Turkey
3. Department of Otolaryngology-Head and Neck Surgery; Giresun A. Ilhan Ozdemir State Hospital; Giresun Turkey
4. Stem Cell Institute; University of Minnesota; Minneapolis Minnesota U.S.A.
5. Department of Otolaryngology-Head and Neck Surgery; Banco de Olhos de Sorocaba Hospital; Sorocaba São Paulo Brazil
6. Paparella Ear Head and Neck Institute; Minneapolis Minnesota U.S.A.