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In a recently published article by Chandra et al the authors have stated that they conducted a ‘case-controlled’ study to examine the anticoagulant effect of warfarin in vitreoretinal surgery.1 However, this study was conducted on a cohort of patients receiving pars plana vitrectomy (PPV); 60 patients who received warfarin (exposure) on the day of …
Competing interests None.
Provenance and peer review Not commissioned; not externally peer reviewed.