1. VA RR&D, National Center for Rehabilitative Auditory Research, VA Portland Health Care System, Portland, Oregon, USA
2. Department of Otolaryngology, Head and Neck Surgery, Oregon Health & Science University, Portland, Oregon, USA
3. OHSU-PSU School of Public Health, Oregon Health & Science University, Portland, Oregon, USA
4. Department of Psychiatry and Behavioral Neurosciences, Wayne State University School of Medicine, Detroit, Michigan, USA.