Key points are not available for this paper at this time.
Duplicate withdrawn; leaves open any clinical or research use of these findings.
The publisher regrets that this was an accidental duplication of an article that has already been published in Eur. J. Echocardiogr., 4 (2003) 262-271, . The duplicate article has therefore been withdrawn.
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MELUZIN et al. (2003) studied this question.
Synapse has enriched 3 closely related papers on similar clinical questions. Consider them for comparative context: