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Submitted on: 21 January 2000.
Revised on: 11 February 2000.
Accepted on: 06 April 2000.
___________________JOURNAL OF THE AMERICAN SOCIETY OF ECHOCARDIOGRAPHY
Submitted on: 11 September 2021.
Revised on: 07 October 2021.
Accepted on: 30 October 2021.
___________________JOURNAL OF THE AMERICAN SOCIETY OF ECHOCARDIOGRAPHY
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