title: Rate of penetrating keratoplasty.
authors.forename: Arif O
authors.initials: AO
authors.lastname: Khan
mesh_terms: D006801:Humans; D015948:Keratoplasty, Penetrating / Q000191:economics / Q000706:statistics & numerical data* / Q000639:trends*; D006278:Medicare / Q000639:trends; D014481:United States