1. Department of Educational & Social Policy, Graduate Program of Communication Disorders & Sciences, University of Macedonia, Thessaloniki, Greece
2. Functional Hearing Laboratory, Boys Town National Research Hospital, Omaha, Nebraska, USA
3. Department of Hearing & Speech Sciences, University of Maryland, College Park, Maryland, USA
4. 1st University Otolaryngology Clinic of AHEPA Hospital, Medical School, Aristotle University of Thessaloniki, Thessaloniki, Greece