1Department of Internal Medicine, Tishreen University, Lattakla, Syrian Arab Republic
2Department of Internal Medicine, Al-Assad Hospital, Lattakia, Syrian Arab Republic
3Department of Public Health, Tishreen University, Lattakia, Syrian Arab Republic
4Department of ENT, Tishreen University, Lattakia, Syrian Arab Republic
5Department of General Medicine, Tishreen University, Lattakia, Syrian Arab Republic
*Department of Internal Medicine, Tishreen University, Faculty of Medicine POB 1479, Lattakia 052, Syrian Arab Republic Tel: +963933755240 E-mail: yousser.mohammad@yahoo.com
Dr Yousser Mohammad participated in the study design, writing the manuscript and supervising. Dr Rafea Shaaban participated for the statistical analysis, and the writing of the manuscript. Dr Mustafa Ibrahim participated in the study design and nose examination. Moussa Ismail is a post graduate medical student, he did the data collection and performed plethysmography, and also participated in the drafting of the manuscript.