1. Department of Cardiology; Texas Heart Institute, University of Texas Health Science Center at Houston; Houston Texas USA
2. Department of Medicine, Section of Cardiology; Baylor College of Medicine, University of Texas Health Science Center at Houston; Houston Texas USA
3. Department of Biostatistics, School of Public Health; University of Texas Health Science Center at Houston; Houston Texas USA
4. Department of Internal Medicine, Jackson Memorial Hospital; University of Miami; Florida USA