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Contributors GBH conceptualised the idea to create this article. He also reviewed and provided critical editing to the manuscript text. He acquired and interpreted data used in this article. HEG reviewed and provided critical editing to the manuscript text. He acquired and interpreted data used in this article. PWL performed the literature search, drafted the manuscript, acquired and interpreted data and takes responsibility for the overall content as guarantor. All authors contributed to the acquisition and interpretation of data, drafting and revising the article, and final approval. PWL is the guarantor of this article.
Funding This research was supported in part by an unrestricted grant from Research to Prevent Blindness, Inc, New York; and by Core Grant EYO 6360 from the National Institutes of Health, Bethesda, Maryland, USA.
Patient consent Obtained.
Competing interests None.