[1] Arkansas Childrens Hosp, Dept Cardiovasc Surg, 1 Childrens Way, Little Rock, AR 72202 USA
[2] Alabama Coll Osteopath Med, Div Res, 445 Hlth Sci Blvd, Dothan, AL 36303 USA
[3] Univ South Carolina, Div Res, 1705 Coll St,Close-Hipp Suite 552, Columbia, SC 29208 USA