- Correspondence to Dr Piotr Szymański, Echocardiographic Laboratory, Valvular Heart Disease Department, Institute of Cardiology, Alpejska 42, Warszawa 04-628, Poland;
- Received September 5, 2013
- Revised September 7, 2013
- Accepted September 9, 2013
- First published December 6, 2013.
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