1. Adult rhinosinusitis defined;Lanza;Otolaryngol Head Neck Surg,1997
2. European Position Paper on Rhinosinusitis and Nasal Polyps 2012;Fokkens;Rhinol Suppl,2012
3. Rhinologic causes of facial pain and headache;Ryan;Headache,1978
4. Nasal polyposis and facial pain;Fahy;Clin Otolaryngol Allied Sci,2001
5. Imaging and staging;Mackay,1997