1. Department of Otolaryngology, Head and Neck Surgery, University of Lübeck, Lübeck, Germany
2. Department of Otolaryngology, Head and Neck Surgery, and
3. Department of Pathology, Stanford University School of Medicine, Stanford, California; and
4. Division of Microbial Interface Biology, Research Center Borstel, Leibniz Center for Medicine and Biosciences, Borstel, Germany