Document Type : Original Article
Authors
1 cardiothoracicsurgery,fuclty of medicine ,Beni suef university, Beni suef ,Egypt
2 Department of cardiothoracic surgery,faculty of medicine, Al Azhar university,Cairo, Egypt
3 cardiothoracic surgery,faculty of medicine,Al Azhar university,Cairo, Egypt
4 Department of cardiothoracic surgery , faculty of medicine , Al Azhar university , egypt.
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