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(USA)} , author={{SalahEldeen} and {Mohamed AliSeyed} and {Nazik AElfadil} and {IBN sina national medical college}}, journal={{Global Journal of Medical Research}}, journal={{GJMR}}2249-46180975-588810.34257/GJMR, address={Cambridge, United States}, publisher={Global Journals Organisation}1662937 } @incollection{b0, , title={{Impact of rhinosinusitis inhealth care delivery: the Quebec experience}} , author={{ DGDurr } and { MYDesrosiers } and { CDassa }} , journal={{J Otolaryngol}} 30 , year={2001} } @incollection{b1, , title={{It's normal--structural and functional variations of nose and paranasal sinuses}} , author={{ TKoskenkorva } and { AKristo }} , journal={{Duodecim}} 128 , year={2012} } @incollection{b2, , title={{Hidden unilateral agenesis of the frontal sinus: human cadaver study of a potential surgical pitfall}} , author={{ OBOzgursoy } and { AComert } and { Yorulmazi } and { ITekdemir } and { AElhan } and { BKucuk }} , journal={{Am J Otolaryngol}} 31 , year={2010} } @incollection{b3, , title={{Imaging of chronic and exotic sinonasal disease: review}} , author={{ AKMomeni } and { CCRoberts } and { FSChew }} , journal={{AJR Am J Roentgenol}} 189 , year={2007} } @incollection{b4, , title={{Ethrnoid Labyrinth anatomic study}} , author={{ OEVan Alyea }} , journal={{Arch Otolayngol}} 29 , year={1939} } @incollection{b5, , title={{Multiplanar computed tomographic analysis of frontal recess cells: effect on frontal isthmus size and frontal sinusitis}} , author={{ JMDelgaudio } and { PAHudgins } and { GVenkatraman } and { ABeningfield }} , journal={{Archives of Otolaryngology-Head and Neck Surgery}} 131 30 , year={2005} } @incollection{b6, , title={{Paranasal Sinuses and Nasal Cavity}} , author={{ CFLanzieri }} , booktitle={{Clinical Magnetic Resonance Imaging}} , editor={ RREdelman JRHesselink MBZlatkin JVCrues } Saunders-Elsevier, Philadelphia , year={2006} 64 } @incollection{b7, , title={{Maxillary sinus disease: diagnosis and treatment}} , author={{ GWBell } and { BBJoshi } and { RIMacleod }} , journal={{British Dental Journal Br Dent J}} 210 , year={2011} } @book{b8, , title={{Endoscopic paranasal sinus surgery. 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