1. Department of Speech, Language & Hearing Sciences, Boston University Sargent College, Boston, MA, USA
2. The University of Tokyo Hospital Rehabilitation Center, Tokyo, Japan
3. Department of Otolaryngology, Boston University School of Medicine, Boston, MA, USA
4. Department of Medicine, Division of Infectious Diseases, University of California Irvine School of Medicine, Irvine, CA, USA
5. EBS Healthcare, West Chester, PA, USA
6. Department of Biostatistics, Boston University School of Public Health, Boston, MA, USA