Correction
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**Paroxysmal nocturnal haemoglobulinuria: Nature’s gene therapy?**[R J Johnson, P Hillmen Mol Pathol 2002;55:145–52.](http://mp.bmj.com/lookup/volpage/55/145) The authors’ affiliations were missing from the above paper. They are as follows: R J Johnson, Department of Haematology, Birmingham Heartlands Hospital, Bordesley Green East, Birmingham B9 5SS, UK; P Hillmen, Haematological Malignancy Diagnostic Service, the General Infirmary at Leeds, Great George Street, Leeds LS1 3EX, UK.