In this Protocol, the investigators open their research center to the clinical evaluation of all physician or self-referred children and adults with suspected ET dysfunction (ETD)and/or diseases attributable to that dysfunction, perform a broad panel of ETF tests to diagnose the presence/absence and cause of the dysfunction and then collect from patient records information on the future disease course in those subjects to begin developing a comprehensive database relevant to clinical utility of the various tests. An adult control group consisting of healthy volunteers without a history of significant middle-ear disease will also be entered.