1. Department of Otorhinolaryngology; Eregli State Hospital; Zonguldak
2. Department of Neurology; Adiyaman University Training and Research Hospital; Adiyaman
3. the Chief of Department of Neurology; Tepecik Training and Research Hospital; Izmir
4. the Chief of Department of Otorhinolaryngology; Tepecik Training and Research Hospital; Izmir
5. the Department of Biochemistry; Dokuz Eylul University School of Medicine; Izmir; Turkey
6. the Biochemical Science Division; National Institute of Standards and Technology; Gaithersburg; MD; U.S.A