*VA National Center for Rehabilitative Auditory Research, VA Portland Medical Center, Portland, Oregon, U.S.A.
†Department of Otolaryngology, Oregon Health and Science University, Portland, Oregon, U.S.A.
The authors have no conflicts of interest to disclose.
Supported by grant no. C7448I from the U.S. Department of Veterans Affairs Rehabilitation Research and Development (RR&D) Service. Additional support was provided by the VA RR&D National Center for Rehabilitative Auditory Research (NCRAR) at VA Portland Medical Center.