1. Research Center for Genetic Engineering and Biotechnology “Georgi D.Efremov”, Macedonian Academy of Sciences and Arts, Av. Krste Misirkov 2, 1000 Skopje, R.N.Macedonia
2. University Clinic of Otorhinolaryngology, Faculty of Medicine, Ss. Cyril and Methodius University, Vodnjanska 17, 1000 Skopje, Republic of North Macedonia