1. Department of ENT, Tishreen University Hospital , Latakia 041 , Syria
2. Department of Pathology, Cancer Research Center, Tishreen University Hospital , Latakia 041 , Syria
3. Department of Anesthesiology, Tishreen University Hospital , Latakia 041 , Syria
4. Department of Pathology, Director of Cancer Research Center, Tishreen University Hospital , Latakia 041 , Syria