1. The Section of Cardiac Surgery, Yale University School of Medicine; New Haven Conn USA
2. Division of Cardiology; Emory University School of Medicine; Atlanta Ga USA
3. Department of Epidemiology; Emory University Rollins School of Public Health; Atlanta Ga USA
4. The Section of Cardiovascular Medicine, Yale University School of Medicine; New Haven Conn USA
5. Division of Cardiothoracic Surgery; Emory University School of Medicine; Atlanta Ga USA