1. Department of Otolaryngology; Diskapi Yildirim Beyazit Research and Training Hospital; Ankara Turkey
2. Ege Reflux Study Group; Ege University
3. Department of Otolaryngology; Ege University; İzmir Turkey
4. Section of Gastroenterology; Ege University; İzmir Turkey
5. Department of Electric and Electronics; Ege University Engineering Faculty; İzmir Turkey