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“Transient myeloproliferative disorder and non-immune hydrops fetalis in a neonate with trisomy 21” (February 2014;20:78.e3-4). On page 78.e3 (3rd paragraph, lines 6-8), the sentence should have read “Rhesus isoimmunisation is the commonest immune aetiology, and alpha-thalassaemia is a non-immune cause.” rather than “Rhesus isoimmunisation is the commonest immune aetiology, and beta-thalassaemia is the commonest non-immune cause.” as printed. We regret the error. The article is correct at www.hkmj.org.