1. The Board of Surgical Sciences, Croatian Academy of Medical Sciences , Zagreb , Croatia
2. Department of Health Studies , University of Zadar , Zadar , Croatia
3. Faculty of Medicine , University of Rijeka , Rijeka , Croatia
4. ENT Head and Neck Surgery Department, Faculty of Medicine Eskisehir Osmangazi University , Eskisehir , Turkey
5. ENT Head and Neck Surgery Department, Faculty of Medicine , Kirikkale University , Kirikkale , Turkey