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aDepartment of Cardiology, Texas Tech University Health Sciences Center, Lubbock, TX, USA
bDepartment of Cardiology, Lubbock Heart Hospital, Lubbock, TX, USA
Corresponding author. Department of Medicine, Texas Tech University Health Sciences Center, 3601 4th Street, STOP 9410, Lubbock, TX 79430, USA. Tel.: +1 806 7433155; fax: +1 806 7433148.