1. Department of Otolaryngology-Head and Neck Surgery, University of Iowa, Iowa City, Iowa 52242, United States
2. Department of Otolaryngology, Zhongshan Hospital of Fudan University, Shanghai 200032, China
3. Department of Chemical and Biochemical Engineering, University of Iowa, Iowa City, Iowa 52242, United States
4. Department of Microbiology and Immunology, University of Iowa, Iowa City, Iowa 52242, United States
5. Department of Neurosurgery, University of Iowa, Iowa City, Iowa 52242, United States