RT Journal Article SR Electronic T1 Temporal trends in ophthalmic surgical demand in a universal healthcare system: an Ontario population-based study of over two decades JF BMJ Open Ophthalmology JO BMJ Open Ophth FD BMJ Publishing Group Ltd SP e000937 DO 10.1136/bmjophth-2021-000937 VO 7 IS 1 A1 Tina Felfeli A1 Gener Austria A1 Reeza Menalo A1 Sherif R El-Defrawy A1 Diana Vasiliu A1 Claudia Zanchetta A1 Beate Sander YR 2022 UL http://bmjophth.bmj.com/content/7/1/e000937.abstract AB