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. 2018 May 22;8(5):e021912. doi: 10.1136/bmjopen-2018-021912

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Flowchart of the literature search and identification of randomised controlled clinical trial abstracts; the exclusion of studies took place sequentially in the following order: no abstracts available, not affiliated to AMD, inappropriate study design, no indication for randomisation. AMD, age-related macular degeneration; RCTs, randomised controlled trials.