1. Center for Health Research; Ochsner Clinic Foundation; New Orleans Louisiana
2. Department of Epidemiology; School of Public Health and Tropical Medicine; Tulane University; New Orleans Louisiana
3. Department of Biostatistics and Bioinformatics; School of Public Health and Tropical Medicine; Tulane University; New Orleans Louisiana
4. Department of Community Health Sciences; Fielding School of Public Health; University of California at Los Angeles; Los Angeles California
5. Department of Epidemiology; University of Alabama at Birmingham; Birmingham Louisiana
6. Department of Medicine; School of Medicine; Tulane University; New Orleans Louisiana