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APA Citation
Tummala, N., Waltonen, J. D., Clinger, J. D., Lack, C., & Williams, D. (n.d.). arrested Pneumatization of the Sphenoid: A Normal Variant Easily Mistaken for a Pathologic Entitity. Otolaryngology--head and neck surgery, 151, P157. http://access.bl.uk/ark:/81055/vdc_100174908401.0x00002c