1. Department of Otolaryngology-Head and Neck Surgery, Stanford University School of Medicine, 801 Welch Road, Stanford, CA 94305-5739, USA
2. Department of Otorhinolaryngology, Head and Neck Surgery, Inselspital, University of Bern, Freiburgstrasse, 3010 Bern, Switzerland
3. Department of Molecular and Cellular Physiology, Stanford University School of Medicine, 300 Pasteur Drive, Stanford, CA 94305, USA