1. Department of Otorhinolaryngology–Head and Neck Surgery, Chuncheon Sacred Heart Hospital, Hallym University College of Medicine, Chuncheon, Republic of Korea
2. Nano-Bio Regenerative Medical Institute, Hallym University, Chuncheon, Republic of Korea
3. Department of Rehabilitation Medicine, Chuncheon Sacred Heart Hospital, Hallym University College of Medicine, Chuncheon, Republic of Korea Funded by a grant from the Hallym University Medical Center Research Fund (01-2011-16) and Bio-industry Technology Development (111100-03-2-CG000), Ministry for Food, Agriculture, Forestry and Fisheries, Republic of Korea