1. Department of Otolaryngology - Head & Neck Surgery, The Ohio State University Wexner Medical Center, Columbus, Ohio, United States
2. Department of Otolaryngology - Head & Neck Surgery, Universidad de Concepción, Concepcion, Chile
3. Graduate School of Periodontics and Implant Dentistry, Research Center for Regenerative Medicine and Tissue Engineering, University of the Andes-Chile, Concepcion, Chile
4. Department of Neurosurgery, Universidad de Concepción, Concepcion, Chile