Otolaryngology Clinics of North America | Diagnosis and management of rhinosinusitis: A practice parameter update |
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The Merck Manual Professional Edition | Emergency Medicine Clinics of North America |
Evaluation and management of "sinus headache" in the otolaryngology practice.
24American Academy of Otolaryngology — Head and Neck Surgery | Evaluation of headache in adults |
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Annals of Allergy, Asthma and Immunology Journal | Centers for Disease Control and Prevention |