On page 5370 in the 17 November 2011 issue, there is an error in the unit of hemoglobin concentration, which reads, “(hemoglobin 6.6 mg/dL…).” The correct unit is “hemoglobin 6.6 g/dL.” The fourth sentence of the first paragraph reads, “Laboratory tests showed microcytic anemia (hemoglobin 6.6 mg/dL, mean corpuscular volume 66.8 fL) with normal iron studies and basophilic stippling on the peripheral smear (panel A).” The sentence should have read, “Laboratory tests showed microcytic anemia (hemoglobin 6.6 g/dL, mean corpuscular volume 66.8 fL) with normal iron studies and basophilic stippling on the peripheral smear (panel A).”

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