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Incorrect study design and analysis: visual acuity outcomes after deep anterior lamellar keratoplasty: a case-control study
  1. Gerald McGwin Jr1,2
  1. 1Department of Epidemiology, University of Alabama at Birmingham, Birmingham, Alabama, USA
  2. 2Department of Ophthalmology, University of Alabama at Birmingham, Birmingham, Alabama, USA
  1. Correspondence to Gerald McGwin, Departments of Epidemiology and Ophthalmology, University of Alabama at Birmingham, 609 Eye Foundation Hospital, 1720 University Boulevard, Birmingham, AL 35294, USA; mcgwin{at}uab.edu

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The recently published study by Tan et al1 is described as a retrospective case-control study; however, this is incorrect. The study participants were selected on the basis of an exposure of interest, that is, deep anterior lamellar keratoplasty versus penetrating keratoplasty and matched with respect to age, race and diagnosis. The study participants were followed (retrospectively) …

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