1. Department of Mechanical and Aerospace Engineering, Jacobs School of Engineering and Department of Surgery, Medically Advanced Devices Laboratory, School of Medicine, University of California at San Diego, San Diego, CA, USA
2. Department of Otolaryngology, School of Medicine, Center for Voice and Swallowing, University of California at San Diego, San Diego, CA, USA
3. Department of Pediatrics, School of Medicine, University of California at San Diego, San Diego, CA, USA
4. Department of Bioengineering, Stanford University, Stanford, CA, USA