1. University of Hama Faculty of medicine, , Hama, Syrian Arab Republic
2. Damascus University Otorhinolaryngology Department, Al-Mowassat University Hospital, Faculty of Medicine, , Damascus, Syrian Arab Republic
3. Faculty of dentistry, Al-Wataniya Private University Department Of Pathology, , Hama, Syrian Arab Republic
4. Alassad Medical Centre Department of Dermatology, , Hama, Syrian Arab Republic