1 Medical-Surgical Physiopathology of Cardiopulmunar and Respiratory System and Associated Biotechnologies, Second University of Naples, Italy; Department of Cardiology, Monaldi Hospital, Naples, Italy; Department of Cardiology, Second University of Naples, Italy.
The publisher regrets that this was an accidental duplication of an article that has already been published in Eur. J. Echocardiogr., 4 (2003) 202-208, . The duplicate article has therefore been withdrawn.