Fig. 1From: Development and validation of an administrative data algorithm to identify adults who have endoscopic sinus surgery for chronic rhinosinusitisFlow chart of chronic rhinosinusitis - endoscopic sinus surgery chart review. Chart review was performed for TOH surgical encounters in which ESS was performed during the defined time period. ESS = endoscopic sinus surgery; CRS = chronic rhinosinusitis; TOH = The Ottawa HospitalBack to article page