[1] Univ So Calif, Dept Cardiothorac Surg, Los Angeles, CA 90033 USA
[2] Childrens Hosp Los Angeles, Los Angeles, CA 90033 USA
[3] Columbia Univ, New York, NY USA
[4] Univ Minnesota, Minneapolis, MN USA
[5] Johns Hopkins Univ, Baltimore, MD USA
[6] Deutsch Herzzentrum Berlin, Berlin, Germany
[7] Loyola Univ, Med Ctr, Maywood, IL 60153 USA
[8] Univ Calif Sacramento, Sacramento, CA USA
[9] Freeman Rd Hosp, Newcastle Upon Tyne, Tyne & Wear, England