- Correspondence to Dr David G Kiely, Sheffield Pulmonary Vascular Disease Unit, Royal Hallamshire Hospital, Sheffield Teaching Hospitals NHS Foundation Trust, Glossop Road, Sheffield S10 2JF, UK;
- Received November 19, 2012
- Revised December 11, 2012
- Accepted December 12, 2012
- First published January 24, 2013.
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