US preventive services task force – published final recommendations
American Academy of Otolaryngology-Head and Neck SurgeryNational Library of Medicine
National Guideline Clearing House
National Institute on Deafness and Other Communication Disorders
Hearing loss and its causes- emedicine
Clinical Trials: A service of the U.S. National Institutes of Health
Sinus surgery with PROPEL is an advanced treatment option for chronic sinusitis.