1. Department of Neurology, Harvard Medical School/The Biological Laboratories, Cambridge, Massachusetts.
2. Department of Neurophysiology, Massachusetts General Hospital, Boston, Massachusetts.
3. Department of Otolaryngology, Audiology Clinic, Harvard University Health Services, Cambridge, Massachusetts.
4. Colegio Ciencias de la Salud, Escuela de Salud Pública, Galapagos Institute of Arts and Sciences GAIAS, Universidad San Francisco de Quito, Quito, Ecuador.
5. Harvard Biological Laboratories, Cambridge, Massachusetts.
6. Department of Surgical Sciences, Uppsala University, Uppsala, Sweden.