1. WHO Coronavirus (COVID-19) Dashboard [Internet]. World Health Organization. World Health Organization; 2021 [cited 2021 May 21]. Available from: https://covid19.who.int/.
2. Craven J. COVID-19 vaccine tracker [Internet]. Regulatory Affairs Professionals Society (RAPS). 2021. Available from: https://www.raps.org/news-and-articles/news-articles/2020/3/COVID-19-vaccine-tracker.
3. Global prevalence of glaucoma and projections of glaucoma burden through 2040;Tham;Ophthalmology,2014
4. Preferred reporting items for systematic reviews and meta-analyses: the PRISMA statement;Moher;PLoS Med.,2009
5. Covidence systematic review software [Internet]. Covidence. Veritas Health Innovation, Melbourne, Australia; [cited 2021 May 21]. Available from: https://www.covidence.org/.