Mehta, Ritvik P., Sara L. Mattson, Brian A. Kappus, and Robin L. Seitzman. “Safety of the HyperSound® Audio System in Subjects With Normal Hearing”. Audiology Research 5, no. 2 (November 20, 2015). Accessed August 7, 2020. https://audiologyresearch.org/index.php/audio/article/view/136.